Question

What is 12.5% of 72?

Answer 1

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12.5% of 72 = 9

Explanation:

Note that % is a unit of measurement and it is worth `1/100`

So 12.5% = `12.5/100`

the word 'of' is the same as the mathematical multiply.

Example: `" "2" of "3" " =" " 3+3" " =" "2xx3`
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12.5% of 72 `-> 12.5/100xx72 = 9`

Answer 2

`9`

Explanation:

Fractions, decimals and percents are all different forms of writing the same thing, but they are often used for different purposes.

They are interchangeable.
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`12.5% xx 72` can be written as `cancel12.5^1/cancel100^8 xx 72`

=`color(red)(1/8) xx 72`

=`9`

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It is useful to know some of the common fractions in the various forms by heart. Here are some to start with ........

`1/2 = 0.5 = 50%" "1/4 = 0.25 = 25%" "3/4 = 0.75 = 75%`

`color(red)(1/8 = 0.125 = 12 1/2%)" "3/8 = 0.325 = 32 1/2%`

`5/8 = 0.625 = 62.5%" "7/8 = 0.875 = 87.5%`

`1/3 = 0.bar3 = 33 1/3%" "2/3 = 0.bar6 = 66 2/3%`