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Reteach and Skills Practice Workbook

Reteach and Skills Practice Workbook

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2–6<br />

Name<br />

<strong>Reteach</strong><br />

Problem-Solving Investigation<br />

Date<br />

You estimate an answer when you do not need an exact answer.<br />

Find an exact answer when you need to find exactly how much.<br />

Estimate the answer.<br />

Find the exact answer.<br />

4MR1.1, 4NS3.0<br />

Chapter Resources<br />

Sally has 275 stickers, Joan has<br />

403 stickers, <strong>and</strong> Karen has 377 stickers.<br />

Do the girls have more than<br />

1,000 stamps altogether?<br />

Estimate 275 + 403 + 377<br />

Round 300 + 400 + 400 = 1,100<br />

Think: Two of the numbers were<br />

rounded up. The exact sum is less than<br />

the estimate.<br />

The girls have more than 1,000 stamps.<br />

Ethan has 275 stickers, Zack has<br />

403 stickers, <strong>and</strong> Ricky has 377 stickers.<br />

How many stickers do the boys have<br />

altogether?<br />

Find the sum of 275 + 403 + 377.<br />

275<br />

403<br />

+ 377<br />

1,055<br />

The boys have 1,055 stickers altogether.<br />

Copyright © Macmillan/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.<br />

Choose the correct answer.<br />

Paco has 129 toy cars. His brother has 167 toy cars. How many toy<br />

cars do they have in all?<br />

1. Which plan can help you solve the problem?<br />

A. Estimate the sum of 129 <strong>and</strong> 167.<br />

B. Add 129 <strong>and</strong> 167.<br />

C. Compare 129 <strong>and</strong> 167.<br />

2. How many toy cars do the boys have in all?<br />

F. 300 G. 296 H. 200<br />

Grade 4 31 Chapter 2

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