How_To_Be_Good_At_Math

64 NUMBERS •^ PERCENTAGES

Percentages

Per cent means “per hundred”. It shows an amount

as part of 100. So, 25 per cent means 25 out of 100.

We use the symbol “%” to represent a percentage.

A percentage is a

special type of fraction.

50%

There are 50 robots out of

100 in the red group. We can

write this as 50%. This is the

same as^1 / 2 or 0.5.

10%

In the yellow group, there

are 10 robots out of 100. We can

write this as 10%. This is the

same as^1 / 10 or 0.1.

1%

There is only one green robot

out of a total of 100. We can write

this as 1%. This is the same as

(^1) / 100 or 0.01.
100%
All the robots added
together – green, grey, yellow,
and red – represent 100%.
This is the same as^100 / 100 or 1.
Parts of 100
A percentage is a useful way of comparing
quantities. For example, in this block of
100 robots, the robots are divided into
different colour groups according to
the percentage they represent.
064-065-Percentages.indd 64 29/02/2016 14:10