course 2, lesson 1-5 use the four-step plan to solve each problem. 1. a comic book store took in...
TRANSCRIPT
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
Course 2, Lesson 1-5
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
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
Ratios and Proportional Relationships
Course 2, Lesson 1-5
Ratios and Proportional Relationships
Course 2, Lesson 1-5
•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 can you show that two objects are proportional?
Course 2, Lesson 1-5
Ratios and Proportional Relationships
How did what you learned today help you answer the
HOW can you show that two objects are proportional?
Course 2, Lesson 1-5
Ratios and Proportional Relationships
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.
Ratios and Proportional Relationships
Ratios and Proportional Relationships
Course 2, Lesson 1-5