Example 1: Find percent using a proportion. What is 60% of 500?

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Presentation transcript:

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 100 500 x =300 So, 300 is 60% of 500. 100x = 30000 100 100

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

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

Find using a proportion Find using fractions Find by multiplying by a decimal 40% of 30 75% of 36 95% of 20 12 27 19