Lesson 11, Topic 1
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# Estimation

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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’s (masses)

3. And capacities of any given object.

For example:

a. The length of a pencil is  ≈ 16cm

b. The height of a man is  ≈  1.8m

c. A bag of salt is  ≈ 1kg

Note the symbol     means is ‘approximately equal to’

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

Example:

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

4. The weight of a diary.
5. The amount of water in a glass cup.
6. The amount of medicine in a tea spoon.
7. The time it takes a sportsman to run 100m.
8. The time it takes to fill an empty tank.

Solution

1. m
2. mm
3. kg
4. g
5. ml
6. ml
7. s
8. min error: