Download presentation

Presentation is loading. Please wait.

1
Ratios and Unit Rates

2
**Ratio – a comparison of two quantities by division**

Ratios can be written in three ways: 1) as a fraction in simplest form 2) with the word “ to ” 3) with a colon “ : ”

3
Examples: Four out of five dentists surveyed recommend sugarless gum for their patients who chew gum to :5 5 9 people out of 20 like chocolate ice cream to :20 20

4
**In a class of thirty students, thirteen are boys**

In a class of thirty students, thirteen are boys. Write a ratio for the number of boys to students in the class. 13/ to :30 Write a ratio for the number of boys to the number of girls. 13/ to :17

5
**Out of 100 students, 40 said they had afterschool jobs**

Out of 100 students, 40 said they had afterschool jobs. Write a ratio for the number of students who had jobs to the number who did not. 40/60 = 2/3 40 to 60 = 2 to :60 = 2:3

6
**24 questions correct on a 100-question test **

6 freethrows made out of 10 attempts 6/10 = 3/ to : 5 24 questions correct on a 100-question test 24/100 = 6/ to : 25 5 cookies eaten out of 20 cookies 5/20 = ¼ to : 4

7
**Unit Rate – a rate for “one” of something; a ratio with a denominator of 1.**

If three bananas cost $1.89, how much does one banana cost? $1.89/3 = .63/1 banana

8
Examples: You need to buy soda for a party. The store sells packs for $ Find the unit rate for one 12-pack? $7.80/3 = $2.60/1

9
**You travel 300 miles in five hours. Find the unit rate per hour.**

300/5 = 60 miles/1 hour A girl can jump rope 200 times in 4 minutes. What is the unit rate per minute? 200 / 4 = 50 times/1 minute

10
**Determine which is the better buy:**

You need to buy pizzas for a class party. You can buy 4 large pizzas for $10.00, or you can 7 large pizzas for $ Which is the better buy? $10.00 / 4 = $2.50/1 $19.25 / 7 = $2.75/1 It is cheaper to buy 4 pizzas.

Similar presentations

OK

6-1 Ratios and Unit Rate In September 2012, there were 8 core teachers and 200 students in 7th grade. Find the ratio of teachers to students. Write answer.

6-1 Ratios and Unit Rate In September 2012, there were 8 core teachers and 200 students in 7th grade. Find the ratio of teachers to students. Write answer.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on active listening skills Mp ppt online form 2016 Ppt on viruses and anti viruses test Ppt on carburetor repair Ppt on prime numbers Ppt on obesity diet recipes Ppt on economic reforms in india 1991 Ppt on exponential and logarithmic functions Ppt on collections in java Free ppt on brain machine interface technology