NAME ______________________________ DATE _______________

ACTIVITY

Closest Estimate Problems

Each problem below has a choice of three estimates. Which one do you think is closest? Circle the closest estimate. Then write about why you think this estimate is the closest.

1 The closest estimate for 78 × 7 is:

I think this is closest because:

 200 500 700

2 The closest estimate for 18 × 26 is:

I think this is closest because:

 400 600 1,000

3 The closest estimate for 32 × 54 is:

I think this is closest because:

 500 1,000 1,500

  • 4 Choose one or more of the problems above and solve it to get the exact answer. Show your solution with equations. Did you choose the closest estimate?


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Table of Contents

Investigations 3 in Number, Data, and Space®, Student Activity Book
Contents
Unit 1 Arrays, Factors, and Multiplicative Comparison
Investigation 1
Investigation 2
Unit 2 Generating and Representing Measurement Data
Investigation 1
Investigation 2
Unit 3 Multiple Towers and Cluster Problems
Investigation 1
Investigation 2
Investigation 3
Unit 4 Measuring and Classifying Shapes
Investigation 1
Investigation 2
Investigation 3
Investigation 4
Unit 5 Large Numbers and Landmarks
Investigation 1
Investigation 2
Investigation 3
Unit 6 Fraction Cards and Decimal Grids
Investigation 1
Investigation 2
Investigation 3
Investigation 4
Unit 7 How Many Packages and Groups?
Investigation 1
Investigation 2
Investigation 3
Unit 8 Penny Jars and Towers
Investigation 1
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