4th Grade Common Core Math Plans
2nd 9 weeks – 4th week
Monday November 11 - Friday, November 15, 2013 The student will:
1) Multiply 2-digit numbers by 2-digit numbers using partial products
2) Multiply 2-digit numbers by 2-digit numbers using the lattice method
3) Multiply 2-digit numbers by 2-digit numbers using the expanded algorithm
4) Use estimating to check the reasonableness of answers
Vocabulary
factors
products
partial products
expanded algorithm
traditional algorithm
compensation
doubling
halving
hidden questions
equations
estimations
Materials
Journals
Flipchart
Base ten blocks or Digiblocks
Laminated 1 cm graph paper
Dry erase markers
Application Problems
Class work sheets
Exit Tickets (optional)
Homework sheets
Monday, November 11: Multiplying 2 Digit Numbers Using the Expanded Algorithm (4.NBT.3,
4.NBT.5)
In this lesson 1) Review the expanded algorithm from last week.
2) Introduce an application problem (see Envisions page 185 for an example) to engage
students and to see what multiplication strategies students are using.
3) Discuss the strategies students used to solve the problem. Ask students how we could
record our work using partial products without using a box – if they don’t bring it up, remind
them of the practice from last week where they lined up the partial products under the
problem and then added them up. Model several examples for students. Continue to have
students estimate the answer before solving.
4) Class work – Independent Practice/Problem Solving pages 190 and 191
5) Debrief/Summarizing – Discuss students’ work.
6) Homework – Practice 8-2
Tuesday, November 12: Multiplying 2 Digit Numbers Using the Traditional Algorithm
(4.NBT.3, 4.NBT.5)
In this lesson 1) Review yesterday’s concept and homework.
2) Introduce an application problem to engage students and to see what strategies they use to
solve it.
3) Discuss how students solved the problem and then ask students if they think 2 x 2 problems
could be solved using the traditional method – listen to their ideas about how it would look.
Start with an example of the expanded algorithm students have worked with – beside it, walk
through the steps of the traditional algorithm with the same problem and discuss with students
how the two are related. Work through several examples with students.
4) Class work – Independent Practice/Problem Solving pages 194 and 195 (odd)
5) Debrief/Summarizing – Discuss students’ work.
6) Homework – Reteaching 8-4
Wednesday, November 13: Multiplying 2 Digit Numbers Using the Traditional Algorithm
(4.NBT.3, 4.NBT.5)
In this lesson –
1) Review yesterday’s concept and homework.
2) Introduce an application problem to engage students and to monitor students’ progress.
3) Discuss the strategies students used to solve the problem. Review the steps of the
traditional multiplication algorithm – explain to students that today they are going to be
practicing this algorithm to improve their fluency with it. Work through several examples with
students, reminding students to first estimate the product before solving for it.
4) Class work – Independent Practice/Problem Solving pages 194 and 195 (even)
5) Debrief/Summarizing – Discuss students’ work.
6) Homework – Practice 8-4
Thursday, November 14: Multiplying 2 Digit Numbers Using Compensation with Doubling and
Halving (4.NBT.3, 4.NBT.5)
In this lesson –
1) Review yesterday’s concept and homework.
2) Introduce an application problem (such as 5 x 16) to engage students and to observe what
methods they try.
3) Discuss students’ strategies and then ask students what they remember about the
compensation strategy. Tell students that another way to compensate and make problems
easier is by doubling and halving (see link below) – discuss how doubling and halving are the
inverses of each other. Do several examples with students.
4) Class work – Doubling and Halving Examples
5) Debrief/Summarizing – Discuss students’ work.
6) Homework – More Doubling and Halving Word Problems
Friday, November 15: Solving Multi-Step Multiplication Problems (4.NBT.3, 4.NBT.5, 4.OA.3)
In this lesson 1) Review yesterday’s concept and homework.
2) Introduce a multi-step application problem to engage students and to see how students
tackle the problem.
3) Discuss the strategies students used to solve the problem – if no one brings it up, introduce
the idea of hidden questions (questions you need to answer before you can answer the
question the problem asks). Look at several examples with students and discuss strategies for
solving them.
4) Class work – Reteaching 7-5 or Practice 7-5
5) Debrief/Summarizing – Discuss students’ work.
Additional Resources:
Doubling and Halving (http://www.k-5mathteachingresources.com/support-files/multiplicationstrategy-doubling-and-halving.pdf)