1. Use the determine reasonable answers strategy to solve Exercises 1–4.
Use with Lesson 5
MAFS.7.RP.1.3
Use the determine reasonable answers strategy to solve Exercises 1–4.
1. If the speed limit is 65 miles per hour, what is a reasonable amount of time for the Blackwells to travel 300 miles?
2. There are 400 boys at Oak Middle School and 12% play football. What is a reasonable number of boys that play football?
3. Suppose you are going to dinner and a movie with a friend. If you spend $18 and the movie is 62% of the cost, what is a reasonable cost for dinner?
4. Lisa has 6 coins that total $0.86. What are the coins?
5. A number is multiplied by 13. Then 5 is subtracted from the product. The result is 60. What is the number?
Course 2, Lesson 2-5
Mathematics Florida Standards – Mathematics, numbering and wording from

2. 4. 3 quarters, 2 nickels, 1 penny 5. 5
Use with Lesson 5
MAFS.7.RP.1.3
ANSWERS
1. 5 hours
2. 50
3. $7.00
4. 3 quarters, 2 nickels, 1 penny
5. 5
Course 2, Lesson 2-5
Mathematics Florida Standards – Mathematics, numbering and wording from

3. HOW can percent help you understand situations involving money?
Course 2, Lesson 2-5

4. Mathematical Practices
MAFS.7.RP Use proportional relationships to solve multistep ratio and percent problems.
MAFS.7.EE Solve multi-step real-life and mathematical problems posed with positive and negative rational numbers in any form (whole numbers, fractions, and decimals), using tools strategically. Apply properties of operations to calculate with numbers in any form; convert between forms as appropriate; and assess the reasonableness of answers using mental computation and estimation strategies.
Mathematical Practices
MP1 Make sense of problems and persevere in solving them.
MP3 Construct viable arguments and critique the reasoning of others.
MP4 Model with mathematics.
MP5 Use appropriate tools strategically.
MP6 Attend to precision.
Course 2, Lesson 2-5
Mathematics Florida Standards – Mathematics, numbering and wording from

5. To find percent of change find percent error
Course 2, Lesson 2-5

6. percent of change percent of increase percent of decrease
percent error
Course 2, Lesson 2-5

7. Percent of Change
Words A percent of change is a ratio that compares the change in quantity to the original amount.
Equation percent of change =
Course 2, Lesson 2-5

8. Percent Error
Words The percent error is a ratio that compares the inaccuracy of an estimate, or amount of error, to the actual amount.
Equation percent error =
Course 2, Lesson 2-5

9. HOW can percent help you understand situations involving money?
Course 2, Lesson 2-5

10. HOW can percent help you understand situations involving money?
Sample answers:
You can find the percent of change in the in a real-world situation involving money.
You can find the percent error in the estimated cost of an item compared to the actual cost.
Course 2, Lesson 2-5

11. The next lesson involves solving problems involving sales tax, tips, and markup. How do you think what you learned today will connect with the next lesson?
Course 2, Lesson 2-5