1. The Percent Proportion
Lesson 7-8

2. Percent Proportion
Compares part of a quantity to the whole quantity, called the base, using a percent.
The percent proportion is:
part
percent a p = =
base
100 b
100

3. Percent Proportion What percent of $15 is $9? The part.
The percent is the unknown.
The base always follows the word of.

4. Percent Proportion. p 9 = 15 100 What percent of $15 is $9?
Cross multiply. 15
100
15p = 900
p = 60
So 60% of $15 is $9. 15 15

5. Percent Proportion What number is 30% of 150? The percent.
The base always follows the word of.
The part is the unknown.

6. Percent Proportion. 30 a = 150 100 What number is 30% of 150?
Cross multiply.
150
100
100a = 4500
a = 45
So 45 is 30% of 150.
100
100

7. Percent Proportion 12 is 80% of what number?
The base is the unknown. The base always follows the word of.
The percent.
The part.

8. Percent Proportion. 80 12 = b 100 12 is 80% of what number?
Cross multiply. b
100
80b = 1200
b = 15
So 12 is 80% of 15. 80 80

9. Percent Proportion 3 106.7 Your Turn: What number is 5% of 60?
80 is 75% of what number? 3
106.7

10. Percent Proportion
Working with a partner complete # 8-20 evens page 325.
Homework: Lesson 7-8 # 2-20 evens
Test Friday Lessons 7-6, 7-7, and 7-8