Holt CA Course Fractions, Decimals, and Percents Preparation for NS1.4 Calculate given percentages of quantities and solve problems involving discounts at sales, interest earned, and tips. California Standards

Holt CA Course Fractions, Decimals, and Percents Write 0.7 as a percent. Additional Example 1: Writing Decimals as Percents Use mental math = = 70% Move the decimal point two places to the right and add a percent sign. 70.0%

Holt CA Course Fractions, Decimals, and Percents Write 0.3 as a percent. Check It Out! Example 1 Use mental math = = 30% Move the decimal point two places to the right and add a percent sign. 30.0%

Holt CA Course Fractions, Decimals, and Percents Write as a percent = 5 ÷ 8 = = 62.5% Use division to write the fraction as a decimal. Write the decimal as a percent. Additional Example 2: Writing Fractions as Decimals Method 1: Use pencil and paper.

Holt CA Course Fractions, Decimals, and Percents Write as a percent = 3 ÷ 5 = 0.60 = 60% Use division to write the fraction as a decimal. Write the decimal as a percent. Check It Out! Example 2 Method 1: Use pencil and paper.

Holt CA Course Fractions, Decimals, and Percents 27 out of 50 = Set up a ratio. Write the decimal as a percent. Additional Example 3: Data Analysis Application If 27 out of 50 people surveyed have the newspaper delivered to their home, what percent of these people have the newspaper delivered to their home? = 0.54 = 54% 54% of the people have the newspaper delivered to their home. = 27 ÷ 50 Use division to write the fraction as a decimal.

Holt CA Course Fractions, Decimals, and Percents Check Use estimation to check that the answer is reasonable. Additional Example 3 Continued Because 50% is close to 54%, the answer is reasonable ≈, or 50% ≈ 1212

Holt CA Course Fractions, Decimals, and Percents 11 out of 50 = Write the numerator with a percent sign. Check It Out! Example 3 If 11 out of 50 students surveyed have blue backpacks, what percent of the students have blue backpacks? = 22% 22% of the students have blue backpacks =

Holt CA Course Fractions, Decimals, and Percents Check Use estimation to check that the answer is reasonable. Check It Out! Example 3 Continued Because 20% is close to 22%, the answer is reasonable ≈, or 20% ≈ 1515