1. Example 1: Find percent using a proportion. What is 60% of 500?
Lesson 7.2
Concept: How to find a percent of a number
Guidelines:
• The word of in a mathematical sentence means multiply.
Example 1: Find percent using a proportion.
What is 60% of 500?
= x
x =300
So, 300 is 60% of 500.
100x = 30000

2. Example 2: Finding a percent of a number using fractions.
What is 25% of 40? 10 25
100
÷ 25
= 1 • 40 4
= = 10 1 1

3. Example 3: Find a percent of a number using decimals (Mrs
Example 3: Find a percent of a number using decimals (Mrs. Rigsbee’s favorite method!)
What is 30% of 450?
0.30 • 450 = 1
450
•0.3 13 5
135

4. Find using a proportion
Find using fractions
Find by multiplying by a decimal
40% of % of % of 20