Express the following as $c m$ using decimals:
$4 c m$ $2 m m$

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Solution

As $10 m m = 1 c m$
$1 m m = \frac{1}{10} c m$
$2 m m = 2 \times \frac{1}{10}$
$= \frac{2}{10}$
$= 0.2 c m$
$4 c m 2 m m = 4 + 0.2 = 4.2 c m$

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