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# Ratio - PowerPoint PPT Presentation

Ratio. Leslie Paytes. 2009. 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. .

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## PowerPoint Slideshow about 'Ratio' - sirius

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Presentation Transcript

Leslie Paytes

2009

# 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.")

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

5 to 3

Pull

Pull

as a fraction 5/3

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.

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