ALGEBRA READINESS LESSON 7-2 Warm Up Lesson 7-1 Warm-Up

ALGEBRA READINESS LESSON 7-1 Warm Up Lesson 7-1 Warm-Up How many periods are in a hockey game?

ALGEBRA READINESS “Finding a Percent of a Number” (7-2) How do you find the percent of a number? To find the percent of a number, multiply the number by the percent in its fraction form or decimal form or use a proportion Example:Find 22% of Since “of” in a word problem means “multiply”, we need to multiply the two numbers. Before you multiply, though, you need to clear the percent sign by turning the percent into a fraction or a decimal. Method 1: Multiply by the fraction form of the percent Method 2: Multiply by the decimal form of the percent 22% = Write the percent as a fraction = Divide 250 and 100 by their GCD, % = 0.22 Write the percent as a decimal = 55 Multiply. So 22% of 250 is = 55 Divide 250 and 100 by their GCD, 110 2

ALGEBRA READINESS Find 88% of 250. So, 88% of 250 is % = 0.88 Write 88% as a decimal  250 = 220 Multiply. Method 2 Write the percent as a fraction. Method 1 Write the percent as a decimal. 88% = = Write the percent as a fraction in simplest form = 220 Multiply = Divide 25 and 250 by their GCD, Finding a Percent of a Number LESSON 7-2 Additional Examples

ALGEBRA READINESS Estimate a 15% tip on a restaurant bill of $ Why it works The bill is about $18. I know 10% of 18 is of 18, or 1.8. Then 5% of 18 is half of 1.8, or 0.9. A 15% tip is about $1.80 plus $.90, or $ A 15% tip for a $17.73 bill is about $ % of 18 = Rewrite 15% as 0.15 = ( ) 18 Rewrite 0.15 as = 0.10(18) (18) Use the Distributive Property. = Multiply. What you think = 2.70 Add. Finding a Percent of a Number LESSON 7-2 Additional Examples

ALGEBRA READINESS 1.Find 81% of Use fractions to estimate 74% of Estimate a 15% tip on $ = (8) + 0.1(4) = = $ = Finding a Percent of a Number LESSON 7-2 Lesson Quiz