Unit 7, Lesson 10
Add within 1,000
Grade 2
Activity 1
Sort 3-digit Sums
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Sort the cards into 2 groups with your partner.
- Make a group of expressions that you agree is less challenging to find.
- Make another group of expressions that you agree is more challenging to find.
- Keep any expressions together that you and your partner disagree on.
- Choose an expression that you feel is less challenging.
Find the value of the sum. Show your thinking, using drawings, numbers, or words.
- Choose an expression that you feel is more challenging.
Find the value of the sum. Show your thinking, using drawings, numbers, or words.
- Discuss 1 card you and your partner disagree on. Do you feel the expression is more challenging or less challenging? Explain your reasoning.
Activity 2
Find the Unknown Value
Oh no! Diego spilled paint on his paper. He can’t see all the digits in each of his equations.
- Find the 3-digit number that makes the equation true. Show your thinking, using drawings, numbers, or words.
- Find the 3-digit number that makes the equation true. Show your thinking, using drawings, numbers, or words.
Student Section Summary
We used place value to add 3-digit numbers. We added hundreds to hundreds, tens to tens, and ones to ones, with base-ten blocks, diagrams, and equations. We learned that we may need to compose a ten, a hundred, or both when adding by place value.
Base-Ten Diagram
Unit Form and Equations
3 hundreds + 5 tens + 8 ones
6 tens + 7 ones
3 hundreds + 11 tens + 15 ones
11 tens = 110
15 ones = 15
Adding by Place
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