A Guide to Elementary Story Problems The ability to tackle complex story problems is the culminating work of each elementary grade. By the end of kindergarten, they’re solving add to/take from story problems within 10 as well as put together/take apart problems with both addends unknown. By the end of first grade, they’re solving all addition/subtraction story problem types, include compare problems, within 20. By the end of second grade, they’ve mastered all of the addition/subtraction story problem types within 100 – and even tackled two-step story problems. In third grade, they begin multiplication and solve equal groups/array story problems within 100. By the end of fourth grade, they have mastered all addition, subtraction, multiplication, and division story problem types (including multiplicative compare) with all whole numbers for addition and subtraction and two-digit multipliers and one-digit divisors for multiplication and division. Furthermore, they master multi-step problems with mixed operations, including measurement contexts. In order to truly master this content, we know that daily instruction with a story problem focus is key. When we look at our current results and observe students in class, it is blatantly clear – they are struggling to understand the story problem. This has huge implications for our instruction. We must ensure that operate (the ability to read a story problem and identify the operation(s) to use to solve) and calculate (the ability to do the math with the numbers to get an answer) are seen as separate – and that operate is recognized as the most difficult part of a story problem for a child – and therefore prioritized. To ensure we prioritize operate, we need to elevate the importance of representations as a way for students to show their understanding. We need a series of representations on a continuum that applies to all story problem situations – that will provide a common language for our students and teachers. By emphasizing representations, we are prioritizing operate, and this will lead to greater and deeper student understanding of story problems. On the following page is a table of representations across K-12. The first six (manipulatives, 1:1 drawing, 1:1 tape diagram, tape diagram, bar model, equation) are the focus in elementary school. The large and bolded Xs denote focal representations for a given grade. Probability Model Proportion Bar x x x x x Verbal Description Statistical Graph x x x X x x x x Area Model Coordinate Grid Number Line Organized List Table Inequality X x x x x X x x x x x x x x Expression x x X X Equation x X Bar Model x X Tape Diagram/ Number Bond X x 1:1 Tape Diagram/ Number Bond X x x x x 1:1 Drawing Manipulatives K 1 2 3 4 5 6 7 8 9 10 11 12 x x X X X X x x x x x x x x x x x x x x x x x x x X X X x x x x x x x x x x x x x x x x The rest of this guide works to explain and link story problems throughout elementary school. The guide includes: - K-4 Story Problem Protocol (page 3): o The protocol relies on represent as the foundation and builds in complexity over time, while maintaining a link between grades. This will create a common language for students and teachers throughout their elementary schooling. - Addition & Subtraction Situations & Representations (pages 4-6): o We know that representations are the key to understanding story problems. We also know that we need normed representations across story problem types with clear examples. Those are included. - Multiplication & Division Situations & Representations (pages 7-8): o We know that representations are the key to understanding story problems. We also know that we need normed representations across story problem types with clear examples. Those are included. - Math Stories Agenda (pages 9-10): o Daily work with story problems is no longer a nice-to-have. It is essential. This agenda focuses on the group representations early and transitions to student directed representations in the middle and later stages. - Elementary Story Problems Scope & Sequence (page 11): o This further breaks down the story problems by grade into a sequence of introducing each story problem type to maximize understanding, student’s ability to represent, and ensuring each story problem type has the opportunity to build with/off of other types. K-4 Story Problem Protocol Kindergarten Second Grade Third Grade Fourth Grade “Make a mind movie” “Picture what’s happening in the problem” “Visualize the problem as you listen/read” “Visualize the problem as you listen/read” “How can we show what’s happening?” - Represent “How can we show what’s happening?” - Represent “How can we represent the problem?” - Represent “What are we trying to figure out?” “What are we trying to figure out?” -Tell back the story using the representation. “Retell the problem.” -Tell back the story using the representation. “Retell the problem.” -Tell back the story using the representation. “Retell the problem.” “How can we represent the problem?” - Represent “How can we represent the problem?” - Represent +/- and 2-step +/1) bar model x/÷ and 2-step mixed 2) other +/-/x/÷ 3) bar model Multi-Step 4) other “What do we know?” “What do we know?” -Equation “What equation can we write?” -Solve and check “Figure it out and check your math with your representation” -Equation “What equation can we write?” -Solve and check “Figure it out and check your math with your representation” -“Write/Tell your answer in a sentence” – state the answer in the context of the problem -“Write/Tell your answer in a sentence” – state the answer in the context of the problem Solve *use K-4 represent continuum *There were 7 apples on the table. Some were red and some were green. How many of each could there be?” *use K-4 calculate continuum Represent & Retell Visualize “Make a mind movie” First Grade -Include “We need to know/figure out _____.” -Include “We need to know/figure out ____.” “What are we trying to figure out?” -Situation equation (solution equation if it happens) “What equation can we write?” -Equation (situation or solution; move towards solution) “What equation can we write?” -Solve and check “Figure it out and check your math with your picture/cubes” -Solve and check “Figure it out and check your math with your picture” -Solve and check “Figure it out and check your math with your representation” -“Finish the story” – state the problem and answer in a sentence -“Finish the story” – state the problem and answer in a sentence -“Finish the story” – state the problem and answer in a sentence *There were 7 apples on the table. 3 were red and 4 were green. Addition & Subtraction Situations & Representations Take From Add To *Representations: 1:1 – one to one, 1:1TD – one to one tape diagram, TD – tape diagram, BM – bar model (two-step bar model includes expression in one bar) Result Unknown (AT-RU) 4 bunnies sat on the grass. 6 more bunnies hopped there. How many bunnies are on the grass now? 4+6= Change Unknown (AT-CU) 8 bunnies were sitting on the grass. Some more bunnies hopped there. Then there were 20 bunnies. How many bunnies hopped over to the first bunnies? 8 + = 20 Start Unknown (AT-SU) Some bunnies were sitting on the grass. 12 more bunnies hopped there. Then there were 20 bunnies. How many bunnies were on the grass before? + 12 = 20 Potential Misunderstandings: generally not an issue for students; this is the most simple SP type Potential Misunderstandings: students often add both numbers, ignoring that the larger number is the total and not one of the addends Potential Misunderstandings: very difficult for students to start with an unknown; makes it tough for them to represent 1:1 1:1 1:1 1:1TD/NB 1:1TD/NB 1:1TD/NB TD/NB TD/NB TD/NB BM BM BM Result Unknown (TF-RU) 10 apples on the table. I ate 6 apples. How many apples are on the table now? 10 – 6 = Change Unknown (TF-CU) 20 apples were on the table. I ate some apples. Then there were 8 apples. How many apples did I eat? 20 - = 12 Start Unknown (TF-SU) Some apples were on the table. I ate 8 apples. Then there were 12 apples. How many apples were on the table before? - 8 = 12 Potential Misunderstandings: sometimes students add the two amounts because they’re used to the Add To problems; this is the most simple subtraction SP type Potential Misunderstandings: when students read a subtraction problem they want to “take away”, but this has the “take away” part unknown; it’s uncomfortable for them; thinking part/part/whole can help Potential Misunderstandings: this allows students to “take away” an amount – but with the start amount unknown, this becomes a very difficult SP type; part/part/whole helps, because they’ll need to think “add” to solve the “subtraction” problem 1:1 1:1 1:1TD/NB 1:1TD/NB 1:1 1:1TD/NB Put Together/Take Apart TD/NB TD/NB TD/NB BM Total Unknown (PT/TA-TU) BM Both Addends Unknown (PT/TA-BAU) BM Addend Unknown (PT/TA-AU) 4 red apples and 6 green apples are on the table. How many apples on the table? 4+6= Grandma has 10 flowers. How many can she put in her read vase and how many in her blue vase? (Should be able to name multiple combinations; in some cases, all comb.) 10 = + 20 apples are on the table. 8 are red and the rest are green. How many apples are green? 20 = 8 + OR 20 – 8 = Potential Misunderstandings: students often answer this SP type correctly, but it can be “right answers for wrong reasons”; their default is to add; this SP type is challenging because there is no inherent “action” in the story Potential Misunderstandings: this SP type relies on the understanding that there are multiple ways to make the same number; students struggle because there are multiple right answers and they may need to find one, many, or all solutions; manipulatives to show the whole can help students see how to break it into “parts” – however, it can also cover up confusion by not making students ‘choose’ to start with the total Potential Misunderstandings: this is easy for adults – they use the subtraction equation to represent and solve; students struggle because they don’t see a “take away” action; we must ensure that subtraction indicates “separating” or “making parts” and not “take away”; this will help them relate addition to subtraction and use part/part/whole to understand this SP type 1:1 1:1TD/NB 1:1 1:1 1:1TD/NB 1:1TD/NB TD/NB TD/NB TD/NB BM BM BM Notes on Representations: 1) Number Bonds and Tape Diagrams can be interchangeably used for Add To/Take From and Put Together/Take Apart stories. 2) Some students understand Number Bonds better because of the line connecting the parts to the whole. For other students, the tight link between the Tape Diagram and the Bar Model is more meaningful. 3) Number Bonds traditionally have the total on top and the parts below. They are shown here with an opposite orientation to make it clear that both are acceptable and to show a stronger alignment to the Tape Diagram. 4) The Tape Diagram can also be adjusted to use a brace instead of a bar – as seen in the Engage NY resources; the pro is alignment to that curriculum, the con is that it’s less directly linked to the bar model Bigger Unknown – More (C-BU-M) Bigger Unknown – Fewer (C-BU-F) Julie has 12 more apples than Lucy. Lucy has 8 apples. How many apples does Julie have? 8 + 12 = Smaller Unknown – Fewer (C-SU-F) Smaller Unknown – More (C-SU-M) Lucy has 12 fewer apples than Julie. Julie has 20 apples. How many apples does Lucy have? 20 – 12 = Potential Misunderstandings: this requires students to represent both quantities and then find the difference – relating this to subtraction is a challenge but solving with manipulatives helps students understand Potential Misunderstandings: because students’ default is to add, they can get this SP type correct without truly understanding; representations are important for gauging student understanding Potential Misunderstandings: the language of “fewer” makes this particularly challenging; students try to represent an amount that isn’t there (12 fewer) 1:1 1:1 1:1TD 1:1TD TD TD Compare Difference Unknown – How Many More/Fewer? (C-DU-M/F) Lucy has 8 apples. Julie has 20 apples. How many more apples does July have than Lucy? BM BM Lucy has 8 apples. Julie has 20 apples. How many fewer apples does Lucy have than Julie? 8 + = 20 OR 20 – 8 = Lucy has 12 fewer apples than Julie. Lucy has 8 apples. How many apples does Julie have? 8 + 12 = Julie has 12 more apples than Lucy. Julie has 20 apples. How many apples does Lucy have? 20 – 12 = Potential Misunderstandings: similar to the above, students get to represent both quantities and this helps them; understanding that x more for y person is the same as x fewer for z person is crucial Potential Misunderstandings: here, “fewer” actually means the student needs to add – this is challenging; students need to interpret and represent this SP type sentence by sentence – and then work to put it all together to solve Potential Misunderstandings: similar to the SP type to the left, but in this one, “more” means to subtract; representing each sentence and then putting it all together can help students understand 1:1 1:1 1:1 1:1TD 1:1TD 1:1TD TD TD TD BM BM BM Notes on Compare Situations: 1) Students need to be fluid with the idea that if someone has more, the other has less; that if someone has 1 more, the other has 1 less; that if someone has 3 more, the other has 3 less; etc. 2) “Julie has 2 more than Lucy”. Students need to hear and say two separate sentences – Julie has more. Julie has 2 more. Arrays, Area Equal Groups Multiplication & Division Situations & Representations Unknown Product (EG-UP) Group Size Unknown (EG-GSU) Number of Groups Unknown (EG-NGU) 3x6= There are 3 bags with 6 plums in each bag. How many plums are there in all? Measurement: You need 3 lengths of string, each 6 inches 3 x = 18 and 18 ÷ 3 = If 18 plums are shared equally into 3 bags, then how many plums will be in each bag? Measurement: You have 18 inches of string, which you will cut x 6 = 18 and 18 ÷ 6 = If 18 plums are to be packed 6 to a bag, then how many bags are needed? Measurement: You have 18 inches of string, which you will cut into pieces long. How much string will you need altogether? into 3 equal pieces. How long will each piece of string be? that are 6 inches long. How many pieces of string will you have? Potential Misunderstandings: this is the easiest multiplication SP type; occasionally students default to addition – but they also tend to realize that in G3, they wouldn’t add 3+6 – even if they don’t understand why they should multiply Potential Misunderstandings: representing the knowns and then taking the action required to solve helps students with this SP type; initially they only divide to solve; as they relate multiplication to division, they begin to consider using multiplication to solve Potential Misunderstandings: grouping division problems are the hardest for students; they like to have an empty group and add to it – they don’t like to pull out an amount without a visible “group” to put it into 1:1 1:1 1:1 1:1TD 1:1TD 1:1TD TD TD TD BM BM BM Unknown Product (AA-UP) Group Size Unknown (AA-GSU) Number of Groups Unknown (AA-NGU) 3x6= There are 3 rows of apples with 6 apples in each row. How many apples are there? Area: What is the area of a 3 cm by 6 cm rectangle? 3 x = 18 and 18 ÷ 3 = If 18 apples are arranged into 3 equal rows, how many apples will be in each row? Area: A rectangle has area 18 square cm. If one side is 3 cm long, x 6 = 18 and 18 ÷ 6 = If 18 apples are arranged into equal rows of 6 apples, how many rows will there be? Area: A rectangle has area 18 square cm. If one side is 6 cm long, how long is how long is a side next to it? a side next to it? Potential Misunderstandings: similar to the above; additionally the rows/columns vocabulary challenge Potential Misunderstandings: similar to the above; additionally the rows/columns vocabulary challenge Potential Misunderstandings: misunderstanding rows and columns can make this a challenging SP type 1:1 1:1 1:1 Multiplicative Compare 1:1TD 1:1TD 1:1TD TD TD TD BM Larger Unknown (MC-LU) 3x6= A blue hat costs $6. A red hat costs 3 times as much as the blue hat. How much does the red hat cost? Measurement: A rubber band is 6 cm long. How long will the rubber band be when it is stretched to be 3 times as long? BM Smaller Unknown (MC-SU) 3 x = 18 and 18 ÷ 3 = A red hat costs $18 and that is 3 times as much as a blue hat costs. How much does a blue hat cost? Measurement: A rubber band is stretched to be 18 cm long and that is 3 times as long as it was at first. How long was the rubber band at first? BM Multiplier Unknown (MC-MU) x 6 = 18 and 18 ÷ 6 = A red hat costs $18 and a blue hat costs $6. How many times as much does the red hat cost as the blue hat? Measurement: A rubber band was 6 cm long at first. Now it is stretched to be 18 cm long. How many times as long is the rubber band now as it was at first? Potential Misunderstandings: all MC problems are difficult because there aren’t really multiple “parts” to represent – students who think additively will want to repeatedly add 6 to solve, and while it will lead to a correct answer, these problems are asking students to think multiplicatively which also means thinking past a representation for “times as much” Potential Misunderstandings: students must be strong in the relationship between multiplication and division to choose to use division to solve – which is the preferred solution method Potential Misunderstandings: students must be strong in the relationship between multiplication and division to choose to use division to solve – which is the preferred solution method for the contextual problem; whereas multiplication would be the preferred solution method for the measurement example TD TD TD BM BM BM Multi-Step: A big penguin eats 3 times as many grams of fish each day as a small penguin. A big penguin eats 420 grams off fish each day. Altogether, how much do both penguins eat? *The language in the array examples shows the easiest form of array problems. A harder form is to use the terms rows and columns: The apples in the grocery window are in 3 rows and 6 columns. How many apples are in there? Both forms are valuable. *Area involves arrays of squares that have been pushed together so that there are no gaps or overlaps, so array problems include these especially important measurement situations. Math Stories Agenda Math Stories is a component of the math block in elementary school that is specifically designed to give students daily exposure to story problems at their level as well as opportunities to apply the story problem protocol to complex problems. When a new story problem is introduced, the focus is on the representation. Over time, the focus becomes efficiency in solving. This approach intentionally prioritizes understanding the problem and showing that understanding with a representation so that as the complexity and number of steps in a story problem grows, students will remain grounded in their strong ability to represent their understanding. While understanding and representing is at the heart of the Math Stories block, manipulatives and organization of work are also indispensable. Students must have access to appropriate manipulatives (snap cubes and place value blocks) and they must see the importance in organizing their work. Manipulatives help students represent and solve and well-organized work helps them keep track of what they’ve done and where they’re going. In K-1, Math Stories is taught to a small group of students (half the class) on the perimeter of the carpet, by the more experienced teacher twice a week for 30 minutes. In 2nd – 4th grade, Math Stories is taught twice a week for 25 minutes or daily for 15 minutes. The Math Stories Agenda is on the following page and includes 3 different stages with a different agenda for each stage – early, middle, and later. Criteria for Stage Advancement: Math Stories intentionally has 3 stages – early, middle, and later. We know that the level of familiarity with a story problem type impacts the student’s ability to access and engage with the problem. That said, various stages for the Math Stories protocol are a non-negotiable. For teachers, knowing when to move from the Early stage to the Middle stage (and Middle to Later) is both necessary and difficult. Below is an early attempt to distinguish the stages and help teachers know when to move to the next stage. Early: In the Early stage, students use their listening comprehension skills along with scaffolding from the teacher to visualize the problem. Students also work to represent the problem in this stage. The independent work focus is on representing and retelling. Once they demonstrate the ability to effectively represent with manipulatives and retell the story problem on a consistent basis, move to the Middle stage. Middle: In the Middle stage, students are visualizing independently as well as representing on paper/whiteboards. The focus is on efficient ways to represent (moving from manipulatives to 1:1 drawing, to 1:1 tape diagram, to tape diagram, to bar model). Complex story problems generally require us to represent in more complex/abstract ways. Once students demonstrate the ability to effectively represent on whiteboards in the ways noted in the S&S for that grade/month/story problem type, move to the Later stage. Later: In the Later stage, students are responsible for all aspects of the story problem protocol. The teacher still prompts the group, but students visualize, represent and retell, and solve on their own. By focusing on the representation in the Early and Middle stages, this stage should get to focus on the solution strategy (calculation). If you are working in this stage and students are struggling to represent, back up to the Middle or Early stage. EARLY MIDDLE LATER Visualize – 2 minutes 1. T – Read the problem 2. T – Model visualize Visualize – 2 minutes 1. WG – Read the problem 2. S – Visualize Visualize – 2 minutes 1. WG – Read the problem 2. S – Visualize Represent & Retell – 12 minutes 1. WG – Act it out together 2. S – Represent with manipulatives 3. WG – Teacher records drawing of student manipulative representations (2-3 students) a. WG/TT – How does that represent the story? 4. TT – Retell using your representation a. WG – 1-2 students share retell Represent & Retell – 12 minutes 1. WG – Act it out together 2. S – Represent on whiteboard 3. TT – Share your representation 4. WG – Teacher records student representations (2-3, least to most sophisticated) a. WG/TT – How does that represent the story? Relating representations to each other 5. TT – Retell using your representation a. WG – 1-2 students share retell Represent & Retell – 4 minutes 1. S – Represent on white board 2. TT – Share your representation a. WG – 1-2 students share representation 3. TT – Retell using your representation a. WG – 1-2 students share retell Solve – 6 minutes 1. WG – Solve together (from sharing students’ manipulative/picture representations) 2. TT – Finish the story a. WG – 1-2 students share their Finish the Story Solve – 6 minutes Solve – 14 minutes 1. S – Solve using your representation 1. S – Solve using your representation a. Early finishers: tell your turtle how you solved; a. Early finishers: tell your turtle how you solved; write write a sentence to tell how you solved; write your a sentence to tell how you solved; write your answer in a sentence answer in a sentence 2. WG – A few students share how they solved (1-3, least to 2. TT – How did you solve the problem? most sophisticated order) 3. WG – Teacher records how students solved (2-3, least to most 3. TT – Finish the Story sophisticated) using the calculation strategy name and a a. WG – 1-2 students share their Finish the Story picture to show the thinking a. WG/TT – How do each of these solve the story? Relating calculation strategies to each other 4. 5. 6. WG – Everyone tries one calculation strategy together T – Recap, all of these ways get the same answer TT – Finish the Story a. WG – 1-2 students share their Finish the Story Practice – 10 minutes 1. Final Practice: Students work on 1-2 more problems, independently, aligned to the S&S, to demonstrate their current level of understanding (time permitting – they also write a sentence to tell how they solved each problem, G1+) 2. On the final day of Math Stories each week, this is a formative assessment to determine next week’s focus for the group; could be done with manipulatives only in the Early stage. Teacher Prompts: Prompts should focus on helping a student identify an error in their representation or calculation and/or helping them move to a more efficient/sophisticated strategy - What strategy did you use? Is that the most efficient way to solve? Why did you use that strategy? What if I did this? Where are you confident about what you did? What does this represent from this problem? Is there another way to represent this? Can you explain what you did here? What in the question makes you think that? Convince me. How do you know? Will that always work? How did your representation help you decide the operation you chose? Can you represent this portion of the story problem for me? (break-it-down) Notes: - T = teacher, WG = whole group, S = students independently, TT = turn and talk - Timing is built from a 30 minute block; if you have 25, cut 5 minutes from practice; if you have 15 (grades 2-4), you likely won’t have any practice time and you’ll need to speed up other parts Elementary Story Problems Scope & Sequence September Kinder E-w/in 5 M-w/in 10 L-w/in 15 1st Grade E-w/in 15 M-w/in 20 L-w/in 30 2nd Grade M-w/in 40 L-w/in 100 3rd Grade M-w/in 100 L-w/in 1,000 (mult/div still within 100) October November December AT-RU, TF-RU Early Manipulatives AT-RU, TF-RU Middle Manip., 1:1 AT-RU, TF-RU Later Manip., 1:1 PT/TA-TU Early/Middle Manip., 1:1 AT-RU, TF-RU, PT/TATU Later Manip., 1:1 January PT/TA-BAU Early/Middle Manip., 1:1 February AT-RU, TF-RU, PT/TA-TU, PT/TA-BAU Later; PT/TA-BAU should only be within 10 Manip., 1:1, Number Bond, EQ (equation) March AT-RU, TF-RU, PT/TA-TU Middle 1:1, 1:1TD/NB, EQ AT-RU, CU TF-RU, CU PT/TA-TU, AU, BAU Middle 1:1TD/NB, TD/NB, EQ AT-RU, SU, CU TF-RU, SU, CU PT/TA-TU, AU, BAU 2-Step Later AT-CU, TF-CU Early/Middle Manip., 1:1, EQ AT-SU, TF-SU Early, Middle Manip., 1:1, EQ C-DU-M/F Early/Middle Manip., 1:1 C-BU-M, C-BU-F Early/Middle Manip., 1:1 C-SU-F, C-SU-M Early/Middle Manip., 1:1 C-DU-M/F, C-BU-M, C-SU-F Middle 1:1TD, TD, EQ AT-SU, TF-SU Middle 1:1TD/NB, TD/NB, EQ PT/TA-BAU, PT/TA-AU Middle 1:1, 1:1 TD/NB, EQ C-BU-F, C-SU-M Middle 1:1TD, TD, EQ AT-RU, CU, SU TF-RU, CU, SU Later TD/NB, EQ PT/TA-TU, AU, BAU Later TD/NB, EQ C-DU-M/F, C-BU-M, C-BU-F, C-SU-F, C-SU-M Later EG-UP, GSU, NGU Early/Middle Manip., 1:1, EQ AA-UP, GSU, NGU Early/Middle Manip., 1:1, EQ EG-UP, GSU, NGU AA-UP, GSU, NGU Middle/Later 1:1TD, TD, EQ C-DU-M/F, C-BU-M, C-BU-F, C-SU-F, C-SU-M Later TD, EQ All 2-Step with All 4 Operations Early/Middle/Later TD, EQ April C-DU-M/F, C-BU-M, C-SU-F Later 1:1, 1:1 TD, EQ All 2-Step Early/Middle 1:1TD, TD May June AT-CU, RU TF-CU, RU PT/TA-AU, BAU, TU Later 1:1, 1:1TD/NB, EQ All 2-Step Later TD, EQ All 2-Step with All 4 Operations Middle/Later BM, EQ 4th Grade TD/NB, BM, EQ TD, BM, EQ All 2-Step with All 4 Operations Middle/Later BM MC-LU, SU, MU Early/Middle TD, EQ MC-LU, SU, MU Later BM, EQ Multi-Step All 4 Operations Early/Middle TD, EQ Multi-Step Multi-Step All 4 Operations All 4 Later Operations BM, EQ Middle TD, EQ Note: Be sure to review previous problem types. This can be done as the problem within the agenda and/or in the student IP problems. The IP problems should not all be the same story problem type as what’s noted in the S&S or what was used for the agenda problem. Appendix: 1. 2. 3. 4. 5. 6. First Three – sample story problems for each month of the K-4 Math Stories S&S (pages 12-15) Math Stories – Teacher Note-Taking Tool (page 16) Addition & Subtraction Calculation Strategies – by grade and in order of least to most sophisticated (page 17) Multiplication & Division Calculation Strategies – by grade and in order of least to most sophisticated (page 17) Addition & Subtraction Calculation Strategies – Illustrated (page 18-19) Multiplication & Division Calculation Strategies – Illustrated (page 20) Appendix 1. First Three – Sample story problems for each month of the K-4 Math Stories S&S Kinder E-w/in 5 M-w/in 10 L-w/in 15 September October November December January February -Sam had 2 toys. He got 2 more toys. How many toys does Sam have now? -Sam had 4 apples. He ate 3 of them. How many apples does Sam have now? -Sam had 5 toys. He gave 3 toys to a friend. How many toys does Sam have now? -Sam had 8 apples. He gate 2 apples. How many apples does Sam have now? -Sam had 4 pencils. He got 3 more pencils from the bin. How many pencils does he have now? -Sam had 9 toys. He gave 4 toys to a friend. How many toys does Sam have now? -12 bunnies were in the grass. 4 bunnies hopped away. How many bunnies are in the grass now? -6 dogs were at the park. 5 more dogs came to the park. How many dogs are at the park now? -Sam ate 7 pieces of candy. Then he ate 6 more pieces of candy. How many pieces of candy did Same eat? -Sam saw 3 snowmen on the way to school. Sam saw 2 snowmen on the way home from school. How many snowmen did Sam see? -4 green apples and 3 red apples were on the table. How many apples were on the table? -4 kids at the park were on the swings and 5 kids at the park were on the slide. How many kids were at the park? AT-RU, TF-RU, PT/TATU Later -Sam has 5 crayons. Some are red and some are blue. How many could be red and how many could be blue? -There are 8 little dogs and big dogs at the park. How many of each could there be? -There are 7 vegetables on the plate. Some are carrots and some are peas. How many could be carrots and how many could be peas? March April May June AT-RU, TF-RU, PT/TA-TU, PT/TA-BAU Later; PT/TA-BAU should only be within 10 Note: Be sure to review previous problem types. This can be done as the problem within the agenda and/or in the student IP problems. The IP problems should not all be the same story problem type as what’s noted in the S&S or what was used for the agenda problem. 1st Grade E-w/in 15 M-w/in 20 L-w/in 30 nd 2 Grade M-w/in 40 L-w/in 100 -Buddy had 12 bones. Then he found 6 more bones. How many bones does Buddy have now? -Buddy had 15 toys in his bin. He took out 8 toys to play with. How many toys are in Buddy’s bin now? -Buddy chased 9 squirrels Monday and 8 squirrels Tuesday. How many squirrels did Buddy chase Monday and Tuesday? -Buddy had 12 bones. Then he got some more. Now he has 19 bones. How many bones did Buddy get after the first 12? -Buddy had 13 toys in his bin. He took some out to play with. Now there are 5 toys in his bin. How many toys did Buddy take out of his bin? -Buddy ate 3 treats. Then he ate some more treats. In all, Buddy ate 7 treats. How many treats did Buddy eat after the first 3? -Buddy had some bones. Then he got 4 more. Now he has 12 bones. How many bones did Buddy have to start? -Buddy had some toys in his bin. He took out 6 to play with. Then there were 5 in his bin. How many toys were in his bin before? -Some dogs were at the park. 3 more came to the park. Then there were 12 dogs at the park. How many dogs were at the park before? -There were 12 dogs at the park. Some were playing and 7 were lying down. How many dogs were playing at the park? -Buddy has 13 bones and treats. How many bones and how many treats could he have? -14 toys are in Buddy’s bin. 5 are balls and the rest are stuffed animals. How many are stuffed animals? -Buddy has 11 bones. Fido has 8 bones. How many more bones does Buddy have than Fido? -Buddy ate 4 treats. Fido ate 13 treats. How many fewer treats did Buddy eat than Fido? -8 dogs were at the park on Tuesday. 14 dogs were at the park on Wednesday. How many more dogs were at the park Wednesday than Tuesday? *make sure to represent with addition and subtraction number sentence *toss in a review type to ensure they don’t just subtract all month -Buddy has 4 more bones than Fido. Fido has 7 bones. How many bones does Buddy have? -Buddy at 5 fewer treats than Fido. Buddy ate 6 treats. How many treats did Fido eat? -There were 7 fewer dogs at the park Thursday than Wednesday. There were 12 dogs at the park Thursday. How many dogs were at the park Wednesday? *toss in a review type to ensure they don’t just add all month September October November December January -Rosa saw 17 ants on a hill at the park. Some more ants came. Then there were 36 ants on the hill. How many ants came to join the first 17 ants? -Rosa has 35 flowers. 19 are roses and the rest are tulips. How many are tulips? -There were 16 forks and 16 spoons on the table for the family dinner. How many pieces of silverware were on the table for dinner? -Rosa has 34 pieces of candy. Jackie has 19 pieces of candy. How many more pieces of candy does Rosa have than Jackie? -Rosa has 13 more pencils than Jackie. Jackie has 18 pencils. How many pencils does Rosa have? -Jackie has 9 fewer library books than Julie. Julie has 23 library books. How many library books -Rosa saw some meerkats at the zoo popping out of their holes. Then 13 more meerkats popped out of their holes. Then there were 37 meerkats popping out. How many meerkats were popping out before? -Rosa had some animal crackers in her box. She gave 16 of them to her friend for a snack. Now she has 13 animal crackers left for herself. How many animal -Jackie saw 16 fewer birds than Rosa at the zoo. Jackie saw 19 birds at the zoo. How many birds did Rosa see at the zoo? -Rosa had 8 more fries than Jackie on her lunch tray. Rosa had 33 fries on her lunch tray. How many fries did Jackie have on her lunch tray? -Rosa counted the jelly beans in her bag. Then she ate 23 of them. Now there are 68 jelly beans in her bag. How many jelly beans were in Rosa’s bag before? -Rosa collects rocks. She had some in her bag and then she picked up 31 more. Then she had 70 in her bag. How many rocks were in her bag before? -Rosa cleaned up the fallen leaves in her yard. She picked up 58 leaves in the morning. She picked up some more leaves in the afternoon. In all, she picked up 92 leaves. How many leaves did -Buddy has 4 more bones than Fido. Buddy has 13 bones. How many bones does Fido have? -Fido has 7 fewer bones than Buddy. Buddy has 14 bones. How many bones does Fido have? -There were 8 more dogs at the park Friday than Thursday. There were 19 dogs at the park Friday. How many dogs were at the park Thursday? *make sure to represent with addition and subtraction number sentence *toss in a review type to ensure they don’t just subtract all month C-DU-M/F, C-BU-M, C-SU-F Later *review problems AT-CU, RU TF-CU, RU PT/TA-AU, BAU, TU Later *review problems February March April May/June PT/TA-TU, AU, Later C-DUM/F, C-BUM, C-BU-F, C-SU-F, C-SU-M Later -When Rosa was at the zoo, she saw 19 fish, 12 meerkats, and 7 lions. How many animals did Rosa see at the zoo? -When Rosa was at the zoo, she counted 13 tulips, 12 roses, and some daffodils. She counted 38 flowers. How many daffodils did Rosa count at the zoo? -Rosa saw 27 monkeys at the zoo. Her Mom saw 11 monkeys and her sister saw 13. How many -Rosa recycled 32 fewer cans than Ben and Mark combined. Ben recycled 61 cans and Mark recycled 30 cans. How many cans did Rosa recycle? -Rosa had 65 jelly beans. Then she ate 26 of them. The number of jelly beans she had left is 5 more than the number of jelly beans Jackie had. How many jelly beans did Jackie have? -Rosa gave away the 71 rocks from her collection. She gave 27 rocks to her sister, 31 rocks to her Mom, and the rest of her rocks to her brother. does Jackie have? crackers were in the box before? she pick up in the afternoon? more monkeys did Rosa see than her Mom and her sister? How many rocks did she give to her brother? Note: Be sure to review previous problem types. This can be done as the problem within the agenda and/or in the student IP problems. The IP problems should not all be the same story problem type as what’s noted in the S&S or what was used for the agenda problem. September rd 3 Grade M-w/in 100 L-w/in 1,000 (mult/div still within 100) -Mycah counted paper clips one afternoon. He counted 342 in his 3rd grade classroom, 421 in the 3rd grade room across the hall, and 781 in the 4th grade room. How many fewer paper clips did he count in the 3rd grade rooms than the 4th grade room? -Mycah had a baseball card collection. One day, he gave 387 of his cards to his best friend. Another day, he donated 268 of them to a yard sale. After October C-DU-M/F, C-BU-M, C-BU-F, C-SU-F, C-SU-M Later *See previous grades; change numbers November December January February/March April/May/June -Mycah had 7 bags with 6 pieces of candy in each bag. How many pieces of candy are there in all? -Mycah has 36 inches of string which he will cut into 4 equal pieces. How long will each piece of string be? -Mycah has 28 pencils and he wants to give 4 to each of his friends. How many friends can he give pencils to? -Mycah has a page of dog stickers with 8 rows of stickers with 4 stickers in each row. How many stickers are there? -A rectangle has an area of 21 square inches. If one side is 3 inches long, how long is a side next to it? -Mycah wants to put his baseball cards on a poster to display them. If he puts his 33 baseball cards -You need 4 bags of apples, each bag weighing 5 pounds, to bring to a party. How many pounds of apples will you need altogether? -What is the area of an 8 cm by 7 cm rectangle? -Mycah bought 42 boxes of juice at the store. The boxes come in packages of 6. How many packages did Mycah buy? -There are 7 kids coming to Mycah’s birthday party. He wants to have pizza to eat. He also wants to make sure each kid, including himself, gets 6 pieces of pizza. If each pizza comes with 8 slices, how many pizzas does Mycah need to get for his party? -Mycah is 3 years younger than his brother Kurt. Kurt is 28 years younger than his Mom, Nancy. Nancy is 37 years old. How old is Mycah? -Mycah ordered 4 large pizzas from Figidini’s. A large -Mycah bought a package of chocolate chips to bake into cookies. The package he bought included 220 chocolate chips. He plans on making 50 chocolate chip cookies, with five chips each. How many more chocolate chips will Mycah need? -Mycah bought a juice for two dollars and 9 hamburgers for he and his friends at the movie. He spent a total of 47 dollars. How much did each hamburger cost? -There were 6 horses on the farm. Each one eats 8 pounds of oats in one day. How many pounds of oats are needed to feed the horses for three days? that, he had 241 baseball cards left. How many baseball cards were in Mycah’s collection to start? -Mycah helped his teacher clean out the crayon bins. There were 427 crayons in all the bins. They threw away 249 crayons that were too broken or too small to use. Then they put 145 new crayons into the bins. How many crayons are in the bins now? into rows of 3, how many rows will there be? pizza has 2 more slices than a medium. A medium has 8 slices. How many total slices did Mycah order? Note: Be sure to review previous problem types. This can be done as the problem within the agenda and/or in the student IP problems. The IP problems should not all be the same story problem type as what’s noted in the S&S or what was used for the agenda problem. th 4 Grade September/October November December January February March/April/May/June -Kendria had $235 to spend on 7 books. After buying them, she had $11 left. How much did each book cost? -Kendria can ride her bike 12 miles in an hour. How many miles could she ride if she rode from 9:00 in the morning to 4:00 in the afternoon? -Kendria had 873 stickers. She gave 8 stickers each to 10 friends. How many stickers does Kendria have left? -A soft-cover book costs $8. A hardcover book costs 3 times as much as the soft-cover book. How much does the hardcover book cost? -A grown-up penguin eats 32 ounces of fish a day and that is four times as much as a baby penguin eats in a day. How many ounces of fish does a baby penguin eat in a day? -A rubber band was 6 cm long as first. Now it is stretched to be 18 -The garden behind Kendria’s house is 9 ft wide. How wide will the garden be when it is extended to be 4 times as wide? -The area of a garden is extended to be 450 square feet and that is 3 times as large as it was at first. What was the area of the garden at first? -Kendria caught the ball 42 times at baseball practice -Kendria had 205 stickers. She bought 24 from a store in the mall and got 48 for her birthday. Then Kendria gave 12 of the stickers to her sister and used 52 to decorate a poster. How many stickers does Kendria have left? -Oceanside Bike Rental Shop charges $12 plus $8 an hour for renting a bike. Sally paid $76 dollars to rent a bike. How many hours did she have the bike rented for? -Kendria has four times as many pennies as Alana and half as many pennies as Rebecca. If Alana has six pennies, -Kendria has 12 crayons. Emma has twice as many as Kendria, and Lily has twice as many as Emma. How many crayons do the girls have in all? -Kendria bought three bags of candy with 75 pieces in each one. She plans to divide all the candy evenly among her seven friends. How many pieces of candy will Kendria have left for herself? -There are 84 bicycles and 79 cars in the garage at Kendria’s apartment building. -Jake treaded water for 279 seconds. Kendria treaded water for 5 minutes and 8 seconds. How many more seconds did Kendria tread for? -Kendria planted vegetables in a garden that was 20 feet long and 20 feet wide. She used 1/4 of the area for corn and 1/2 of the area for peas. How many square feed are left for other vegetables? -A rectangular field is 63 yards long and 21 yards wide. A fence is needed for the perimeter of the field. Fencing is also needed to divide the field into three square sections. How many feet of fencing are needed? cm long. How many times as long is the rubber band now as it was at first? yesterday and how many does How many wheels are her friend Dante Rebecca have? there in the garage? caught the ball 14 times. How many times as many did Kendria catch the ball at practice compared to Dante? Note: Be sure to review previous problem types. This can be done as the problem within the agenda and/or in the student IP problems. The IP problems should not all be the same story problem type as what’s noted in the S&S or what was used for the agenda problem. 2. Math Stories – Teacher Note-Taking Tool Agenda Focus Student Early Able to ACCESS the problem? Early/Middle Able to REPRESENT the problem? Type of representation Middle/Later CALCULATION strategy for solving Later ANSWER Correct? Number Sentence? Able to FINISH THE STORY? 3. Addition & Subtraction Calculation Strategies – by grade *building efficiency from left to right Kindergarten First Grade – w/in 20 w/in 100 Count All Count On Stick and Dots Second Grade – w/in 100 w/in 1,000 Sticks and Dots Third Grade Fourth Grade Count On Count Back Expanded Notation Addition Number Line Count Up Make Tens Just Know Mental (add tens and tens; add ones and ones) Expanded Notation Add by Place Compensate Subtraction Expanded Notation Add by Place Keep One Number Whole Subtraction Flats, Sticks, and Number Line Dots Maintenance of fluency developed in second grade. Prioritize – Expanded Notation Subtraction and Add by Place/Keep One Number Whole (+) Expanded Notation (-)/Add by Place (+) Standard Algorithm 4. Multiplication & Division Calculation Strategies – by grade *building efficiency from left to right Unknown Addend Unknown Addend Third Grade - w/in 100 Arrays/Groups – Concrete Arrays/Groups – Pictorial Count-On/Skip-Count Distributive Property Fourth Grade – 4x1 and 2x2 mult. 4x1 division Place Value Arrays Concrete Place Value Sharing/Grouping - Concrete Place Value Arrays - Pictorial Area Model Partial Products Place Value Sharing/Grouping - Pictorial As Group Size Area as Side Length 7. Just Know An Illustration of the Addition & Subtraction Strategies by Grade: Kindergarten: 1) Within 10/20 Count All: count all items with manipulatives, drawing, or on fingers Count On: 5+3 --- put first addend on fingers, count, number said is total --5…6, 7, 8 First Grade: 1) Within 20 Count On: (see GK) Count Back: 10-7 --- put total on fingers, count back the subtract amount, number said is part/answer -- 10… 9/8/7/6/5/4/3 Count Up: 10-7 --- put up fingers as you count from the part/lesser amount to the whole/larger amount, number of fingers up is the difference --- 7…8/9/10 Make Tens: 5+7 -- know “ten” combination, make a 10, and add the leftover -- 5 and 5 is 10, and 2 more is 12 (breaking the 7 into 5 and 2) Just Know: 5+7 -- I just know this fact – 5 and 7 is 12 First Grade: 1) Within 100 Count On: (see GK) -Count on Tens and then Count on Ones - 56 + 30… 56…66, 76, 86 - 56 + 32… 56…66, 76, 86, 87, 88 - 56 + 35… 56…66, 76, 86, 87, 88, 89, 90, 91 Sticks & Dots: (G1 is 2-digit + 1-digit) General: Add 10s and 1s separately 1) III… + II.. --10/20/30/40/50/51/52/53/54 /55 Special: Count on by 10s 1) III… + II.. --- 33/43/53/54/55 Expanded Notation Addition: (G1 is 2-digit + 1-digit) 1) 23+22 --20+ 3 + 20+ 2 40+ 5 =45 Mental: using general or special Sticks & Dots method mentally Second Grade: 1) Within 1,000 Sticks & Dots (1): (see G1; Flats, Sticks, & Dots in G2) Number Line (2): 1) 327+243 Expanded Notation Subtraction (3): 1) 327-243 (also 327+243) 120 200 +100 300+ 20+ 7 - 200+ 40+ 3 0+ 80+ 4 =84 Add by Place (4): 1) 327+243 3 2 + 2 4 5 0 6 1 3 7 Keep One Number Whole (6): 1) 327+243 Unknown Addend (7): 1) 327-243 2) 327-243 Compensate (5): 1) 264-198 2) Add 2 to both 264 and 198 --- 266-200 --- 66 + 3 2 5 5 2 0 2 4 6 5 7 + + 7 0 7 0 7 3 0 7 3 0 0 0 0 3) 264+198 4) Give 2 from 264 to 198 --- 262+200 --- 462 2) 327 – 243 (w/out regroup) - 3 2 1 2 0 2 4 8 8 Third Grade: 1) Within 1,000 Fourth Grade: 1) Within 1,000,000 8. 7 0 7 0 7 3 4 Maintenance of fluency developed in second grade Expanded Notation (-) and Add by Place/Keep One Number Whole (see G3) Standard Algorithm An Illustration of the Multiplication & Division Strategies by Grade: Third Grade – w/in 100 Arrays/Groups – Concrete: use counters to build arrays and/or groups to model, count all/on Arrays/Groups – Pictorial: draw arrays and/or group to model, count all/on Count-On/Skip-Count: Count by Zs or Ys to solve Z x Y; I know 5x2 is 10, count on 5 more – 15 is 5 x 3 Fourth Grade – 4x1 and 2x2 multiplication Place Value Arrays – Concrete: 1) Build the frame with PV blocks and multiply the parts 2) 13 x 12 Place Value Arrays – Pictorial: 1) Draw the frame with Flats, Sticks, & Dots and multiply the parts 2) 13 x 12 Area Model: 1) Use numbers to make the place value frame; then multiply the parts 2) 13.12 4x1 division Distributive Just Know: Property: I know 5x7 is 35 and I 5x7 is the can explain it if asked same as 5x5 and 5x2 – so that’s 25 and 10 more – 5x7 is 35 Partial Products: 1) See the value of the digits 2) Multiply all of the parts; ones x ones, ones x tens, tens x ones, tens x tens Place Value Sharing/Grouping – Concrete: 1) Gather the total in place value blocks 2) Share into the number of groups, or pull out groups by size 3) Regroup hundreds for tens, tens for ones as needed Place Value Sharing/Grouping – Pictorial: 1) Draw the total using Flats, Sticks, & Dots 2) Share into the number of groups, or pull out groups by size 3) Regroup hundreds for tens, tens for ones as needed 4) 156 ÷ 12 As Group Size: 1) Draw the number of groups 2) Share tens/hundreds (with known fact), record with version of standard algorithm 3) Regroup as necessary 4) Share tens/ones (with known fact) Division as Side Length: 1) Think about division as multiplication 2) 12 times what equals 156? 3) Find a factor for the hundreds/tens 4) Multiply, subtract 5) Find a factor for the tens/ones 6) Multiply, subtract 7) Add up the place value side lengths