Express the following as centimetres using decimals: $30 m m$

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Solution

Expressing in centimeters using decimals:
We know that $1 c m = 10 m m$ ,
$\Rightarrow 1 m m = \frac{1}{10} c m$
The given expression is $30 m m$ .
So,
$\begin{array}{rcl} 30 m m & = & 30 \times \frac{1}{10} c m \\ = & \frac{30}{10} c m \\ = & 3.0 c m \end{array}$
Hence, $30 m m$ as centimetre is $3 c m$ .

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