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6-8 Grade 7 Unit 8 Lesson 1

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K-5 Math •6-8 Math 9-12 Math

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Grade 6 •Grade 7 Grade 8

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Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Unit 7 •Unit 8 Unit 9

Lesson

•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

K-5
6-8
9-12

Grade 6
Grade 7
Grade 8

Accelerated 6
Accelerated 7

Unit 1
Unit 2
Unit 3
Unit 4
Unit 5
Unit 6
Unit 7
Unit 8
Unit 9

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

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Curriculum

IM K-5 Math
IM 6-8 Math
IM 9-12 Math

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Unit 8, Lesson 1

Mystery Bags

Grade 7

Practice

Problem 1

Student Task Statement

Lin is interested in how many of her classmates watch her favorite TV show, so she starts asking around at lunch. She gets these responses:

yes
yes
yes
no
no
no
no
no
no
no
yes
no
no
no

If she randomly selects one more person to ask, do you think they will say yes or no? Explain your reasoning.

to access Practice Problem Solutions.

Problem 2

Lesson 1 Resources

Student Materials Student Materials in Spanish

Student Task Statement

An engineer tests the strength of a new material by seeing how much weight it can hold before breaking. Previous tests using this material have held these weights in pounds:

1,200
1,400
1,300
1,500
950
1,600
1,100

Do you think that the material will be able to hold more than 1,000 pounds in the next test? Explain your reasoning.

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Problem 3

Student Task Statement

A company tests two new products to make sure they last for more than a year.

Product 1 has 950 out of 1,000 test items that last for more than a year.
Product 2 has 150 out of 200 test items that last for more than a year.

If you had to choose one of these two products to use for more than a year, which one is more likely to last? Explain your reasoning.

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Problem 4

Student Task Statement

Put these numbers in order from least to greatest.

0.6
0.3

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Problem 5

ForLesson 15: Distinguishing Volume and Surface Area

Student Task Statement

A small staircase is made so that the horizontal piece of each step is 10 inches long and 25 inches wide. Each step is 5 inches above the previous one. What is the surface area of this staircase?

A small staircase consisting of 3 steps is indicated.

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