1. Section 5-1 Ratios and Rates

2. Motivation

3. Ratio A comparison of two quantities by division Examples: 17/25, 17 to 25, 17:25

4. Example 1 The recommended fuel for Suzanne’s snow blower is made from 80 quarts of gasoline and 1 quart of motor oil. Write each ratio in all three forms. A. Quarts of gasoline to quarts of oil B. Quarts of oil to quarts of fuel mixture

5. Definitions Rate: a ratio that compares two quantities measured in different units 75 miles in 3 hours or 75 mi/3 hr Unit Rate: a rate in which the second quantity in the comparison is one unit Ex: 75 mi/3 hr =

6. Example 2 Find the unit rates and write them in both fraction and word form. A. Gordon memorized 560 vocabulary words in 28 days. B. Pete added 12 ounces of chocolate chips to a recipe that yielded 48 cookies.

7. Example 3 Honey lemon cough drops come in packages of 30 drops per 10-ounce bag. Cherry cough drops come in packages of 24 drops per 6- ounce box. Tell which package has the greater ratio of drops to ounces.

8. Practice Page 262 Homework: Worksheet 5-1

9. Closure Give an example of a ratio in the three forms. Give an example of a rate.