Unit Rates Lesson 6 2 Vocabulary A rate
Unit Rates Lesson 6 -2
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
You Try: don’t forget to divide. • Find the unit rate for each situation. – 120 miles in 2 hours – $2. 37 for 3 pounds of grapes – Which of the following rates, is a unit rate? Explain. or ,
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.
You Try: • Write the unit rate as a ratio. Then find an equal ratio. – You earn $5. 25 in 1 hour. How much do you earn in 5 hours? – You type 25 words per minute. How many words can you type in 10 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. 043125 0. 05125 The 48 fl. oz. bottle is the better value. $0. 04 per fl. oz. $0. 05 per fl. oz.
Lets Try Another: • Find the unit price to determine the better buy. – Yogurt: 6 ounces for $. 68 32 ounces for $2. 89
You Try: • Find the unit price to determine the better buy. – Phone call: 3 minutes for $. 42 15 minutes for $1. 35 How can all of this help you go grocery shopping?
- Slides: 12