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K-5 Grade 5 Unit 5 Lesson 15

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Lesson 15

Warm-up Activity 1 Activity 2 Activity 3

Unit 5, Lesson 15

Estimate and Subtract

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 subtract decimals. Describe what he does in each step.
Use the standard algorithm to find the value of .

Activity 2

Which whole number is the difference closest to? Explain or show your reasoning.
What is the value of ? Explain or show your reasoning.
Which whole number is the difference closest to? Explain or show your reasoning.
What is the value of ? Explain or show your reasoning.

Activity 3

Find the value of . Explain or show your reasoning.
Elena and Andre try to find the value of . Who do you agree with? Explain or show your reasoning.

Elena, Subtract. The two numbers are right aligned. 6 hundred 22 point 3 5, minus, 71 point 4, equals, 6 hundred 15 point 2 1. Quote, my answer makes sense because 6 hundred 15 and 21 hundredths is less than 6 hundred 22 and 35 hundredths. Andre, Subtract. The two numbers are right aligned. 6 hundred 22 point 3 5, minus, 71 point 4 0, equals, 5 hundred fifty point 9 5. Quote, my answer makes sense because 6 hundred 20 minus seventy equals 5 hundred fifty. So my answer should be right around 5 hundred fifty.