Holt CA Course Introduction to Percents Preparation for NS1.4 Calculate given percentages of quantities and solve problems involving discounts at sales, interest earned, and tips. Also covered: NS2.4 California Standards

Holt CA Course Introduction to Percents Vocabulary percent

Holt CA Course Introduction to Percents A percent is a ratio of a number to 100. The symbol % is used to indicate a percent. The word percent means “per hundred.” So 6% means “6 out of 100.” Reading Math = 6%

Holt CA Course Introduction to Percents Write the percent modeled by each grid. A. B. Additional Example 1: Modeling Percents shaded total _______ ___ = 32% shaded total _______ ___ = 66%

Holt CA Course Introduction to Percents Write the percent modeled by each grid. A. B. Check It Out! Example 1 shaded total _______ ___ = 44% shaded total _______ ___ = 75%

Holt CA Course Introduction to Percents Write 28% as a fraction in simplest form. Additional Example 2: Writing Percents as Fractions So 28% can be written as. Write the percent as a fraction with a denominator of 100. Simplify. 28% = = 7 25

Holt CA Course Introduction to Percents Write 90% as a fraction in simplest form. Check It Out! Example 2 So 90% can be written as. Write the percent as a fraction with a denominator of 100. Simplify. 90% = = 9 10

Holt CA Course Introduction to Percents Additional Example 3: Writing Percents as Decimals Write 17% as a decimal. Method 1 Use pencil and paper. 17% = = 0.17 Write the percent as a fraction with a denominator of 100. Divide 17 by 100. Method 2 Use mental math. 17% = 0.17 Move the decimal point two places to the left.

Holt CA Course Introduction to Percents Check It Out! Example 3 Write 24% as a decimal. Method 1 Use pencil and paper. 24% = = 0.24 Write the percent as a fraction with a denominator of 100. Divide 24 by 100. Method 2 Use mental math. 24% = 0.24 Move the decimal point two places to the left.