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Home > Maths I > Numbers and Money > Basic fractions

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 20 ?

Method 1 is to find 1 \over 5 of 20, then multiply by 3

1 \over 5 of 20 is 20 ÷ 5 = 4

We need 3 \over 5 of 20, so we multiply 4 by 3

3 \over 5 of 20 = 4 x 3 = 12

Method 2 is to multiply 3 \over 5 by 20.

 

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

Question

Use either method to find 3 \over 7 of 35

Answer

The answer is 15.

(Using Method 1: 1 \over 7 of 35 is 5, and 3 x 5 = 15

 

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