Fraction of a quantity

To find $\dfrac{2}{3}$ of 18 oranges, 
we divide the 18 oranges into three equal parts. This makes three equal parts of six oranges. Then we take two of these parts.

This can be calculated as follows:

$\dfrac{1}{3}$ of 18 = 6. (18 ÷ 3 = 6)

and so $\dfrac{2}{3}$ of 18 = 2 × 6 = 12.

Question 3

Find $\dfrac{4}{5}$ of 15.

Solution

In the diagram $\dfrac{1}{5}$ of 15 = 3 is shown. There are 5 equal parts of 3 rectangles.

So $\dfrac{4}{5}$ of 15 = 4 × 3 = 12.

Question 2

Question 4