How will you write $7 c m 5 m m$ in $c m$ using decimals?

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Solution

We know that, $1 c m = 10 m m$ .
Also, $1 m m = \frac{1}{10} c m$
For converting $m m$ into $c m$ , we have to multiply the given value in $m m$ by $\frac{1}{10}$ .
$7 c m 5 m m = 7 + 5 \times \frac{1}{10} c m$
$= 7 + \frac{5}{10} c m$
$= 7 + 0.5 c m$
$= 7.5 c m$ .
Therefore, $7 c m 5 m m$ $= 7.5 c m$

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