#### 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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This was very helpful.

NICE