Question 3 (d)

Express the following as cm using decimals:

9cm 8mm

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Solution

We know that 10 mm = 1 cm
$∴ 1 m m = \frac{1}{10} c m$

$\Rightarrow 9 c m 8 m m = 9 c m + 8 m m = 9 c m + 1 m m \times 8 = 9 c m + \frac{1}{10} c m \times 8 = 9 c m + 0.8 c m = 9.8 c m$

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