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

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Presentation transcript:

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

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

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

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

equal 12872bc an equality of two ratios adbc

Examples

Solving A Proportion

do cross products

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