Topic: Adding 2 digit numbers
Grade 2
Ashley Ennis
TEKS: Math (2.111.14.2.3.B) model addition and subtraction of two-digit numbers with objects, pictures,
words, and numbers.
TLW: use models to add and subtract 2 digit numbers.
Quality Questions: Why do we draw out the number as tens and ones? Why do we need to regroup?
Core: Have a 2 digit off decade number + a 2 digit off decade number written on the Qomo. Ask a student
volunteer to show how they would solve that problem. Student will be show their thinking by writing on the
Qomo. Ask if another student has a different way they solved it. Student will show their thinking on the
Qomo.
IP: Day 3 (Word Problems+Regroup Tens and Ones, Comparing Numbers)
Small group: Counting on and off the decade using popsicle sticks and/or unifix cubes, solving 2 digit plus 2
digit addition and subtraction problems (Off decade + Off decade). Place a number under the cover, then
place one bundle (uncovered)and asked how many? Progress to 1,2 and/or 3 bundles, etc. Record
students' thinking. Also remove bundles for subtraction tasks and missing subtrahend tasks.
OR
Pose two-digit addition problems. Encourage students to use fact strategies to solve and teacher records
thinking on an ENL or other strategies. Ex. 53+23 Students may use a double strategy to solve. 53+3 is 56
+ 2- is 76. OR 50+20 is 70, 3+3 is 6 so 76. Example: 62+28 Students may use a make 10/think 10 strategy
to solve. 62 and 8 is 70 plus 20 is 90 OR 60+20 is 80 and 2 and 8 is 10 so 80+10 is 90. Students may solve
it another way. Teacher discuss and record all solution on an anchor chart. **Number range is dependent
upon level of small group.
Assessment: Student work and student participation
Students using the Qomo tablet to show her thinking in solving the problem 25 + 99=.