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Reteach and Skills Practice Workbook

Reteach and Skills Practice Workbook

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7–2<br />

Name<br />

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

Date<br />

Problem–Solving Skill: Reasonable Answers<br />

Jeff wants to invite some friends over for dinner. He has a large<br />

rectangular table <strong>and</strong> knows there is room to seat 10 people on each<br />

of the long sides <strong>and</strong> 4 on the two ends of his table.<br />

4MR3.1, 4NS3.0<br />

Chapter Resources<br />

If Jeff wants everyone seated at the table, how many friends can he<br />

invite? Is it reasonable for him to invite 40 people?<br />

Step 1: Underst<strong>and</strong>. What facts do you know?<br />

Jeff can seat 10 people on each of the long sides of his table.<br />

Jeff can seat 4 people on each of the ends of his table.<br />

Jeff wants everyone seated at the table.<br />

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

Step 2: Plan. What you need to know?<br />

How many friends is it reasonable for Jeff to invite?<br />

Step 3: Solve. What math do you need to do?<br />

You need to figure out the number of people that can sit at the table,<br />

based on all of the amounts that you have.<br />

2 long sides, 10 people each: 10 × 2 = 20<br />

2 ends, 4 people each: 4 × 2 = 8<br />

Add the amounts: 20 + 8 = 28 people can sit at the table.<br />

Step 4: Check. See if your answer makes sense.<br />

When you compare the amount that can sit at the table, 28, to the<br />

amount of people that Jeff wants to invite, 40, you can see that it is not<br />

reasonable for him to invite 40 guests. If Jeff only has seats for 28, how<br />

many friends should he invite? (Remember, Jeff needs a seat too!)<br />

Use the steps above to solve the following problem.<br />

Brittany was given 3 movies to watch in her free time. Each movie is<br />

100 minutes long. Brittany has 70 minutes to relax before she goes<br />

to work every day, Monday through Friday. Is it reasonable for her to<br />

expect to watch all three movies, starting Monday <strong>and</strong> ending on Friday?<br />

Grade 4 117 Chapter 7

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