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K-5 Grade 2 Unit 4 Lesson 11

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Lesson 11

Warm-up Activity 1 Activity 2

Unit 4, Lesson 11

Different Ways to Add and Subtract

Grade 2

Warm-up

Find the value of each expression mentally.

Activity 1

Diego and Tyler find the value of . Their work is shown.

Diego’s method:

<p>Number line. Scale 0 to 55 by 5's. Evenly spaced tick marks. Arrow from 53 to 33, labeled 20. Arrow from 33 to 30, labeled 3. Arrow from 30 to 24, labeled 6.</p>

Tyler’s method:

<p>Number line. Scale 0 to 55 by 5's. Evenly spaced tick marks. 3 arrows. First arrow, 53 to 50, labeled 3. Second arrow, 50 to 44, labeled 6. Third arrow, 44 to 24, labeled 20.</p>

Use Diego’s method to find the value of .
Use Tyler’s method to find the value of .

Activity 2

Partner A

Find the value of .
Find the value of .

Partner B

Find the value of .
Find the value of .

School supplies.