Unit 4, Lesson 10
Place Value and the Number Line
Grade 2
Warm-up
What do you notice? What do you wonder?
Activity 1
Clare subtracts and represents her work with a base-ten diagram. 
- Write an equation to represent Clare’s work.
- Represent Clare’s method on the number line.
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Find the value of .
Show your thinking using a base-ten diagram.
- Represent how you found the value of on the number line.
Activity 2
Diego finds the value of . He says he can count on by tens, then by ones. He uses a number line to show what he means.
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Write an equation to show the sum for Diego’s work.
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Find the value of .
Show your thinking using the number line.
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Find the value of .
Show your thinking using the number line.
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Find the value of .
Show your thinking using the number line.