Find Percentages of Given Numbers using a Calculator

This activity is about finding percentages of numbers using a calculator. 

 

When working out a percentage, we are actually trying to calculate an amount out of a hundred.

Percent means out of a hundred. 

 

If we are working out 40% of a number, we can do this by considering 40% as 40/100 which means 40 ÷ 100 = 0.40. 

 

So we can work out 40% of 20 by 0.40 x 20.

Try putting this into your calculator, you should get an answer of 8.  

 

Let us look at some more examples. 

 

 

 

Example 1

30% of 80

30%  means 30/100 = 0.30 

0.30 x 80 = 24 

 

Example 2

60% of 400 

60% means 60/100= 0.60 

0.60 x 400 = 240 

 

Example 3 

70% of 90 

70% means 70/100 = 0.70 

 0.70 x 90 = 63 

 

Do you feel ready to try some on your own?