Ratios and Rates Mrs. Kuznia Math 8 Day 5 Brainpop ionandpercent/ratios/

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Presentation transcript:

Ratios and Rates Mrs. Kuznia Math 8 Day 5

Brainpop ionandpercent/ratios/ ionandpercent/ratios/

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!!!!

RATIOS Ratios can be written, or expressed, three different ways to :

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

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.

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

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.

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

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?