Express as $c m$ using decimals $8 c m 5 m m$ ?

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Solution

Use the unit conversion of $c m$ and $m m$
We know that
$\begin{array}{rcl} 1 m m & = & \frac{1}{10} c m \\ \Rightarrow & 5 m m = \frac{5}{10} c m = 0.5 c m \end{array}$
$\begin{array}{rcl} \Rightarrow & 8 c m and 5 m m = 8 c m + 0.5 c m = 8.5 c m \end{array}$
Hence, $8 c m 5 m m$ can be expressed in $c m$ as $8.5 c m$

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