Course 2, Lesson 1-5 Use the four-step plan to solve each problem. 1. A comic book store took in $2,700 in sales of first editions during November. December

Course 2, Lesson 1-5

Use the four-step plan to solve each problem.

1. A comic book store took in $2,700 in sales of first editions during November.

December sales of first editions are expected to be double that amount. If

the first editions are sold for $75 each, how many first editions are expected

to be sold in December?

2. Nolan is selling coupon books to raise money for a class trip. The cost of the

trip is $400, and the profit from each coupon book is $15. How many

coupon books does Nolan need to sell to earn enough money to go on the

class trip?

3. Porter’s Café made a $6,000 profit during January. Ms. Porter expects

profits to increase $500 per month. In what month can Ms. Porter expect her

profit to be greater than his January profit?13


ANSWERS

1. 72

2. 27 coupon books

3. May

HOW can you show that two objects are proportional?

Ratios and Proportional Relationships



Course 2, Lesson 1-5 Common Core State Standards © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.

• 7.RP.2Recognize and represent proportional relationships between quantities.

• 7.RP.2aDecide whether two quantities are in a proportional relationship, e.g., by testing for equivalent ratios in a table or graphing on a coordinate plane and observing whether the graph is a straight line through the origin.

Mathematical Practices

1 Make sense of problems and persevere in solving them.

2 Reason abstractly and quantitatively.

3 Construct viable arguments and critique the reasoning of others.

4 Model with mathematics.

• To determine whether two quantities are proportional by graphing them on a coordinate plane





•coordinate plane •quadrants•ordered pair•x-coordinate•y-coordinate•y-axis•origin•x-axis

How did what you learned today help you answer the




How did what you learned today help you answer the




Sample answers:• By recognizing that the graph of a proportional

relationship is a straight line that passes through the origin

Describe how you can tell whether a relationship between two quantities

is proportional.




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Course 2, Lesson 1-5 Use the four-step plan to solve each problem. 1. A comic book store took in $2,700 in sales of first editions during November. December