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Maths I

Basic fractions

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Fractions of a quantity

Boy doing his maths homework.

How do we find $3 \over 5$ of ?

Method 1 is to find $1 \over 5$ of , then multiply by

$1 \over 5$ of is $20 \div 5 = 4$

We need $3 \over 5$ of , so we multiply by .

$3 \over 5$ of $20 = 4 \times 3 = 12$ .

Method 2 is to multiply $3 \over 5$ by .

$3 \over 5$ × = ${3 \over 5} \times {20 \over 1} = {60 \over 5} = 12$

Question: Use either method to find $3 \over 7$ of .

Answer

The answer is 15.

(Using Method 1: $1 \over 7$ of is and $3 \times 5 = 15$

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