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K-5 Grade 5 Unit 5 Lesson 12

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•K-5 Math 6-8 Math 9-12 Math

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Lesson 1 Lesson 2 Lesson 3 Lesson 4 Lesson 5 Lesson 6 Lesson 7 Lesson 8 Lesson 9 Lesson 10 Lesson 11 •Lesson 12 Lesson 13 Lesson 14 Lesson 15 Lesson 16 Lesson 17 Lesson 18 Lesson 19 Lesson 20 Lesson 21 Lesson 22 Lesson 23 Lesson 24 Lesson 25 Lesson 26

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Lesson 12

Warm-up Activity 1 Activity 2

Unit 5, Lesson 12

Estimate and Add

Grade 5

Warm-up

Find the value of each expression mentally.

Activity 1

Find the value of . Explain or show your reasoning.
Han uses the standard algorithm to add decimals. Describe what he does in each step.
Use the standard algorithm to find the value of .

Activity 2

Which whole number is the sum closest to? Explain or show your reasoning.
What is the value of ? Explain or show your reasoning. Use the standard algorithm if it is helpful.
Which whole number is the sum closest to? Explain or show your reasoning.
What is the value of ? Explain or show your reasoning. Use the standard algorithm if it is helpful.