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## JSS1: MATHEMATICS - 1ST TERM

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Lesson 11, Topic 1
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# Estimation

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#### Topic Content:

• Estimation

Estimation may be defined as a rough or sensible guess of a value or calculation.

It is useful to be able to estimate the following:

1. Lengths
2. Weight (masses)
3. And capacities of any given object.

For example:

a. The length of a pencil is  â‰ˆ 16cm
b. The height of a man is  â‰ˆ  1.8m
c. A bag of salt is  â‰ˆ 1kg

Note: the symbol Â  â‰ˆ Â  means â€˜is approximately equal toâ€™

How to choose appropriate metric units of measurement.

The common metric units and their units:

1. Length $$\scriptsize \rightarrow$$ km, m, cm, mm

2. Mass $$\scriptsize \rightarrow$$ tonne, kg, g

3. Capacity$$\scriptsize \rightarrow$$ l, cl, ml

4. Time $$\scriptsize \rightarrow$$ hour, min,  seconds

### Worked Example 11.1.1:

State the appropriate metric unit you would use to measure the following:

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