1. Friday, December 3 Objective: SWBAT find ratios and rates solve proportions Homework: Practice 4-1 Bell Work (write in simplest form)

2. Vocabulary A comparison of two quantities by division. You can write a ratio in different ways. 10:15 10 15 a to ba:b

3. Ratio: 90 3 Rate: 90 miles 3 hours Read as “90 miles per 3 hours.” A rate is a comparison of two quantities measured in different units. Vocabulary

4. A Unit rate is a rate in which the second quantity is 1. unit rate: 30 miles, 1 hour or 30 mi/h The ratio 90 3 can be simplified by dividing: 90 3 = 30 1 Vocabulary

5. equal 12872bc an equality of two ratios adbc

7. Examples

8. Solving A Proportion

9. do cross products

10. 5. Solving an Algebraic Proportion Write cross products Use the distributive property Subtract 5x from each side Subtract 28 from each side Divide each side by 2