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From Exploration Activity 3, it is found that a percentage is
a ratio that describes a part of 100.
20
For example, 20% =
100 ‘Percentage’
means
‘per 100’.

id ou now
The ratio that compares
The diagram shows 10 marbles. the number of parts
What does the ratio 3 : 7 represent in to 100 parts can be
CHAPTER
4 the diagram? expressed in the form
of fraction, decimal
What is the percentage of black marbles
in the diagram? and percentage.

16

In a class, the ratio of the number of girls to the number of boys is 3 : 2. Find the
percentage of the girls in the class.

The ratio of the number of girls to the total number of students = 3 : 5
3
=
5
Change to a fraction
3 3 × 20
= with a denominator
5 5 × 20 of 100.
60 The percentage of the girls
3
= = × 100%
100 5
= 60%
Thus, the percentage of the girls in the class is 60%.

17

Zakaria is thrifty. He saves 30% of his daily pocket money. Find the ratio of his daily
savings to his total daily pocket money received.

The percentage of Zakaria’s daily savings = 30%
30
=
100

The ratio of his daily savings to his total daily pocket money received = 30 : 100
= 3 : 10

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Chapter 4

04 TB Math F1.indd 94 11/10/16 12:12 PM