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## PowerPoint Slideshow about ' Ratio' - sirius

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Ratio*- a comparison of two quantities using division

# of pennies =

# of nickles =

Count the coins to compare the number of pennies to the number of nickles.

*(The word ratio comes from the Latin word ratus which means "calculation." In the middle ages the word ratio was used to mean "computation.")

Compare the number of pennies to nickles

There are three different ways to write a ratio when comparing a part to a part...

Pull

Pull

Use a colon between the two numbers 5:3

using the word "to"

between the two numbers

5 to 3

Pull

Pull

All three are read

5 to 3

Pull

Pull

as a fraction 5/3

Move coins for more info!

Suppose you wanted to compare the number of boys to girls in a class that had 15 boys and 13 girls. The first quantity in this case the boys is always written first

Move the Mathman to reveal the answer

15/13

15 to 13

15:13

Notice with the same numbers 15 boys and 13 girls, a comparision of girls to boys would yield an entirely different answer

Move the Mathman to reveal the answer

13/15

13 to 15

13:15

Suppose you wanted to compare the number of boys to the comparision of girls to boys would yield an entirely different answer total number of students in a class that had 15 boys and 13 girls. The first quantity in this case the boys is always written first.

add numbers

to find total

Hint!

Move Mathman to reveal an additional way to write ratios

15/28

15 to 28

15:28

15 out of 28

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