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6-8 Grade 7 Unit 8 Lesson 11

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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

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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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Unit 8, Lesson 11

Comparing Groups

Grade 7

Practice

Problem 1
Student Task Statement
Compare the weights of the backpacks for the students in these three classes.

seventh grade
A dot plot, seventh grade, “backpack weight in pounds”. The numbers 8 through 25 are indicated. The data is as follows: 8 pounds, 3 dots. 9 pounds, 5 dots. 10 pounds, 7 dots. 11 pounds, 6 dots. 12 pounds, 2 dots. 13 pounds, 1 dot. 14 pounds, 1 dot.

ninth grade
A dot plot, ninth grade, “backpack weight in pounds”. The numbers 8 through 25 are indicated. The data is as follows: 12 pounds, 3 dots. 14 pounds, 1 dot. 15 pounds, 2 dots. 16 pounds, 2 dots. 17 pounds, 2 dots. 18 pounds, 6 dots. 19 pounds, 2 dots. 21 pounds, 3 dots. 22 pounds, 3 dots. 23 pounds, 1 dot.

eleventh grade
A dot plot, eleventh grade, “backpack weight in pounds”. The numbers 8 through 25 are indicated. The data is as follows: 9 pounds, 1 dot. 11 pounds, 1 dot. 13 pounds, 1 dot. 14 pounds, 1 dot. 15 pounds, 3 dots. 16 pounds, 3 dots. 17 pounds, 2 dots. 19 pounds, 3 dots. 20 pounds, 2 dots. 21 pounds, 3 dots. 22 pounds, 2 dots. 24 pounds, 2 dots. 25 pounds, 1 dot.

Lesson 11 Resources

Student Materials Student Materials in Spanish

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Problem 2

ForLesson 11: Percentage Contexts

Student Task Statement

A bookstore has marked down the price for all the books in a certain series by 15%.

How much is the discount on a book that normally costs $18.00?
After the discount, how much would the book cost?

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Problem 3

ForLesson 21: Combining Like Terms (Part 2)

Student Task Statement

Match each expression in the first list with an equivalent expression from the second list.

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Problem 4

ForLesson 2: Adjacent Angles

Student Task Statement

Angles and are complementary. The ratio of the measure of angle to the measure of angle is . Find the measure of each angle. Explain or show your reasoning.

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