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K-5 Grade 2 Unit 7 Lesson 9

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Lesson 9

Warm-up Activity 1 Activity 2

Unit 7, Lesson 9

Add 3-Digit Numbers

Grade 2

Warm-up

Find the value of each expression mentally.

Activity 1

Find the value of each expression. Show your thinking, using drawings, numbers, or words.

Activity 2

Noah and Kiran find the value of .

Noah’s work

Base ten diagram. 5 hundreds labeled 500. 9 tens labeled 90. 15 ones, 10 circled, labeled 10, 5 labeled 5.

Kiran’s work

How are Noah’s and Kiran’s work alike? How are they different?
Who found the correct value? Explain your reasoning.

Two students talking.