Objective:

- You can round a number correct to a given number of significant figures.

When working out an estimate for a value of an expression (or otherwise) round each number correct to one significant figure.

E.G. Calculate an estimate:

(9.8 x 3.9) / 0.14 aprox = (10 x 4) / 0.1 = 40 / 0.1 = 400

This is an overestimate as the numerators have both been rounded up. The demoninator has been rounded down, so when we divide, our answer is even bigger.

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