1 / 10

Ratios and Unit Rates

Ratios and Unit Rates. 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 “ : ”. Examples:.

beau-berry
Télécharger la présentation

Ratios and Unit Rates

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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 4 4 to 5 4:5 5 • 9 people out of 20 like chocolate ice cream 9 9 to 20 9:20 20

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

  5. 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 3 40:60 = 2:3

  6. 6 freethrows made out of 10 attempts 6/10 = 3/5 3 to 5 3 : 5 24 questions correct on a 100-question test 24/100 = 6/25 6 to 25 6 : 25 5 cookies eaten out of 20 cookies 5/20 = ¼ 1 to 4 1 : 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 3 12-packs for $7.80. 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 $19.25. Which is the better buy? $10.00 / 4 = $2.50/1 $19.25 / 7 = $2.75/1 It is cheaper to buy 4 pizzas.

More Related