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JAMB Mathematics 2012 Paper

Question : 3

Total: 48

Evaluate

\frac{21}{9}

to 3 significant figures

Solution:

Concept:

Simplify the fraction first, then round the decimal to

3

significant figures.

Explanation:

Start with the given quotient:

\frac{21}{9} = \frac{7}{3} = 2.3333\ldots

To express this to

3

significant figures, keep the first three digits:

2

3

3

Look at the next digit, which is

3

; since

3 < 5

, we do not round up.

Therefore, the value becomes

2.33

Answer:

2.33

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