Percent Equaion分方程.pptVIP

Cornell Notes Summary Include the following questions and answers in your Cornell Notes Summary. How can you use the equation a = p% ? b to solve a percent problem ? Chapter 12 Lesson 1 The Percent Equation Pages 319-320 1-7 all Cornell Notes – Chap. 12 Lesson 1 Main Ideas/Cues: Percent Details: A ratio whose denominator is 100. The symbol for percent is % Example: = = = 85% 17 20 5 5 ? 17 20 85 100 Cornell Notes – Chap. 12 Lesson 1 Main Ideas/Cues: Percent Equation Details: You can represent “a is p percent of b” with the percent equation. a = p% ? b where a is part of the base b and p% is the percent. Problem #1 First Step: Write the Problem 1. What number is 20% of 110? Problem #1 Second Step: Rewrite the problem using the Percent Equation. 1. What number is 20% of 110? a = p% ? b a = 20% ? 110 Percent Equation Replace variables with given amounts Problem #1 Third Step: Write percent as a decimal. 1. a = 20% ? 110 a = 0.20 ? 110 How do you write a percent as a decimal? Problem #1 Fourth Step: Multiply. 1. a = 0.20 ? 110 a = 22 Answer Problem #2 First Step: Write the Problem 2. What number is 25% of 88? Problem #2 Second Step: Rewrite the problem using the Percent Equation. 2. What number is 25% of 88? a = p% ? b a = 25% ? 88 Percent Equation Replace variables with given amounts Problem #2 Third Step: Write percent as a decimal. 2. a = 25% ? 88 a = 0.25 ? 88 How do you write a percent as a decimal? Problem #2 Fourth Step: Multiply. 2. a = 0.25 ? 88 a = 22 Answer Problem #3 First Step: Write the Problem 3. What number is 40% of 150? Problem #3 Second Step: Rewrite the problem using the Percent Equation. 3. What number is 40% of 150? a = p% ? b a = 40% ? 150 Percent Equation Replace variables with given amounts Problem #3 Third Step: Write percent as a decimal.