2. Ratios and Rates Mrs. Kuznia Math 8 Day 5

3. Brainpop http://www.brainpop.com/math/ratioproport ionandpercent/ratios/ http://www.brainpop.com/math/ratioproport ionandpercent/ratios/

4. What is a ratio? A ratio is a comparison of two quantities measured in the same units. Ratios must always be written in simplest form!!!!

5. RATIOS Ratios can be written, or expressed, three different ways. 1. 3 to 4 2. 3:4 3. 3 4

6. RATIOS There are 3 green aliens and 4 purple aliens. The ratio of green aliens to purple aliens is 3 to 4.

7. RATIOS The ratio of green aliens to total aliens is 3 to 7. The ratio of total aliens to purple aliens is 7 to 4.

8. RATES A rate is a ratio that compares quantities that are measured in different units..

9. Example This spaceship travels at a certain speed. Speed is an example of a rate. Speed can be measured in many different ways. This spaceship can travel 100 miles in 5 seconds. 100 miles in 5 seconds is a rate.

10. RATES Rates are often written in fraction form. 100 miles in 5 seconds is a rate. It can be written as….. Miles Seconds

11. RATES One key word that often identifies a rate is PER. Miles per gallon, Points per free throw, Dollars per pizza, Sticks of gum per pack What other examples of rates can your group think of?