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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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Ratio

Ratio

Leslie Paytes

2009


Ratio

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.")


Ratio

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!


Ratio

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


Ratio

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


Ratio

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