Unit Rates and Comparing Unit Rates Vocabulary A

Unit Rates and Comparing Unit Rates

Vocabulary • A rate is a ratio that compares two quantities measured in different units. • The unit rate is the rate for one unit of a given quantity. Unit rates have a denominator of 1.

Examples Rate: 150 heartbeats 2 minutes Unit Rate (Divide to get it): 150 ÷ 2 = 75 heartbeats per minute.

Find the Unit Rate Amy can read 88 pages in 4 hours. What is the unit rate? (How many pages can she read per hour? ) 88 pages 4 hours 22 pages / hour

Using Unit Rates • You can find the missing terms of equal ratios. • Use the unit rate, and set it equal to another ratio. • Solve for what is missing by dividing or multiplying.

Example Joe’s car goes 25 miles per gallon of gasoline. How far can it go on 8 gallons of gasoline? x 8 Unit Rate 25 miles 1 gallon = 8 gallons x 8 25 x 8 = 200. Joe’s car can go 200 miles on 8 gallons of gas.

Get out Packet • Turn to Pg. 4 (B) • Complete 1 - 8

Try the Following: Find the Unit Rate on Your Paper……. 2. Drive 288 miles on 16 1. Film costs $7. 50 for 3 rolls $2. 50 per roll gallons of gas. 18 mpg 4. Earn $49 for 40 hours of 3. 90 students and 5 18 teachers students per teacher work $1. 23 per hour 5. **Snowfall of 12 ¾ 2 5/6 per hour inches in 4 ½ hours. 6. Use 5 ½ quarts of water for every 2 lbs of 2 ¾ quarts per lb chicken 7. Ian drove 30 miles in 60 mph 0. 5 hours 15 mph 8. Sarah drove 5 miles in 20 minutes

Comparing Unit Prices • Use division to find the unit prices of the two products in question. • The unit rate that is smaller (costs less) is the better value.

Example Juice is sold in two different sizes. A 48 -fluid ounce bottle costs $2. 07. A 32 -fluid ounce bottle costs $1. 64. Which is the better buy? $2. 07 48 fl. oz. $1. 64 32 fl. oz. 0. 043 0. 0512 The 48 fl. oz. bottle is the better value. $0. 04 per fl. oz. $0. 05 per fl. oz.

Get out Textbooks Turn to Pg. 72 # 5, 11, 20 *Workbook Pg. 73 # 11 and 12 Group-Worksheet (Rates, Unit Rates Opener) Pg. 1