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4.1 Ratios

Note that a ratio
Ratio is used to compare two or more quantities of the same has no units.
kind that are measured in the same unit. For example, the
ratio of 5 000 g to 9 kg can be represented as
5 000 g : 9 kg = 5 kg : 9 kg
= 5 : 9
The ratio of a to b is written as a : b.

How do you represent the relationship of three quantities?
CHAPTER
4
LEARNING
STANDARDS
Represent the
relation between
three quantities in
the form of a : b : c.

The picture above shows three photos of different sizes.
How do you represent the relationship of the sizes of these three photos in a ratio?

1

Represent the ratio of 0.02 m to 3 cm to 4.6 cm in the form of a : b : c.

0.02 m : 3 cm : 4.6 cm = 2 cm : 3 cm : 4.6 cm
= 2 : 3 : 4.6
= 20 : 30 : 46
= 10 : 15 : 23

Self Practice 4.1a

1. Represent the relationship of the following three quantities in the form of a : b : c.
(a) 2 weeks to 16 days to 1 week
(b) 0.1 kg to 50 g to 0.25 kg
(c) 4 minutes to 120 seconds to 1.6 hours
1
(d) 3 m to 480 cm to 6 400 mm
5

2. Tahir pays RM5.60 for a plate of nasi beriani, RM1.20 for a glass of tea and 30 sen
for a piece of kuih. Represent the relationship of the prices of nasi beriani, tea and
kuih in the form of a : b : c.

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Chapter 4

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