Percents

1. Percents #20

2. VOCABULARY Most states charge sales tax on items you purchase. Sales tax is a percent of the item’s price. A percent is a ratio of a number to 100. You can remember that percent means “per hundred.” For example, 8% means “8 per hundred,” or “8 out of 100.”

3. F.Y.I. • If a sales tax rate is 8%, the following statements are true: • For every $1.00 you spend, you pay $0.08 in sales tax. • For every $10.00 you spend, you pay $0.80 in sales tax. • For every $100 you spend, you pay $8 in sales tax. Because percent means “per hundred,” 100% means “100 out of 100.” This is why 100% is often used to mean “all” or “the whole thing.”

4. Example 1: Modeling Percent Use a 10-by-10-square grid to model 17%.

5. Example 2: Writing Percents as Fractions Write 35% as a fraction in simplest form.

6. Example 3 Write each percent as a fraction in simplest form. 65%

7. Example 4 Write each percent as a fraction in simplest form. 20%

8. Example 5 Write each percent as a fraction in simplest form. 76%

9. Example 6: Real-World Application Janell has 20% body fat. Write 20% as a fraction in simplest form.

10. Check It Out: Example 7 Timmy is a football player with 10% body fat. Write 10% as a fraction in simplest form.

11. Example 8: Writing Percents as Decimals Write 56% as a decimal.

12. Example 9 Write each percent as a decimal. 32%

13. Example 10 Write each percent as a decimal. 19%

14. Example 11 Write each percent as a decimal. 80%

15. Example 12: Real-World Application Water made up 85% of the fluids that Kirk drank yesterday. Write 85% as a decimal.