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4.2 Rates

What is the relationship between ratios and LEARNING
STANDARDS
rates? Determine the

1 Individual relationship between
ratios and rates.

Aim: To determine the relationship between ratios and rates.
Instruction: Open the folder downloaded from page vii. CHAPTER

1. Open the file ratio and rates.pdf and print the file. 4
2. State the ratio of two quantities for the measurements involved in each of the
situations given.
3. State the quantities involved and also their units of measurement.
Ratio in the Quantities Units of
Situation form a
b involved measurement

A car travels 285 km in 285 km Distance and
3 hours. 3 hours time km and hour

A plant grows 24 cm in
4 months.

A baby’s mass increases by
1.3 kg in 60 days.
Karim’s pulse rate is 75 beats
per minute.
The force acting on the
surface area of 1 square metre
is 2 Newtons.

In Exploration Activity 1, we compare two quantities
measured in different units. For example, in the ratio Rate is a special ratio
that compares two
285 km , we compare the distance travelled in km with the quantities with different
3 hours units of measurement.
285 km
time taken in hours. The ratio is known as a rate.
3 hours
Rates show how two quantities with different units are 1.5 kg 1.5 kg
Whether or
related to each other. 3 kg 3 g
is a rate? Discuss.

81
Ratios, Rates and Proportions

04 TB Math F1.indd 81 11/10/16 12:12 PM