Convert $4000 m m 400 c m$ into meters.

44 m

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4.4 m

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8 m

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80 m

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Solution

The correct option is B $8 m$
We know that, $1$ $c e n t i m e t e r = 10$ $m m$ , $1$ $m e t e r = 100$ $c m$
$1$ $m e t e r = 1000$ $m m$ or $1$ $m m = \frac{1}{10}$ $c m$ or $1$ $m m = \frac{1}{1000}$ $m$

To convert $4000$ $m m$ $400$ $c m$ to $m e t e r s$

$4000 m m$ $400$ $c m$ $= 4000 m m + 400 c m$

Now, $4000$ $m m = \frac{1}{1000} \times 4000$ $m$ $= 4$ $m$
$400$ $c m = \frac{1}{100} \times 400$ $m$ $= 4$ $m$

$4000 m m$ $400$ $c m$ $= 4000 m m + 400 c m = (4 + 4) m$
$= 8$ $m$

So, Option $C$ is correct

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