Lesson 10 – Fractional Parts

Objectives:

At the end of this lesson, students should know what fractional parts are and be able to find fractions of whole numbers or quantities.

NOTE:

The fractional part of a whole number or quantity involves finding the number or quantity that makes up that fraction of the whole number or quantity. It involves multiplying fractions and whole numbers.

Example 1

1/2 of 10 apples

We know that half of 10 apples is 5 apples as shown below.

When finding fractional parts, we simply divide the whole number by the denominator of the given fraction:

I.e. 1/2 of 10 apples also mean 1/2 x 10 apples

10 ÷ 2 = 5

The next step is to multiply the result by the numerator.

I.e. 5 x 1 = 5

Hence,  1/2 of 10 apples is 5 apples.

Example 2

What 3/4 is  of 20?

3/4 of 20= 3/4 X  20/1         This means dividing 20 by 4 and multiply your results by 3.

20 ÷ 4 = 5                            that is 20÷4=5, Multiply 5 by 3

5 X 3 = 15

Hence  3/4 of 20 is 15.

Example 3

 2/5 of 30 =2/5 X  30/1           This means dividing 30 by 5 and multiply your result by 2.

30 ÷ 5 = 6

6  X 2 = 12

Hence 2/5of 30 = 12.

 

 

 

 

 

 

ans= $279