Convert $3 m 40 c m$ into millimeters.

7000 m m

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3400 m m

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4300 m m

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700 m m

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Solution

The correct option is B $3400 m m$
We know that

$1$ $m e t e r = 100$ $c m$

$1$ $c e n t i m e t e r = 10$ $m i l l i m e t e r$

$1$ $m e t e r = 1000$ $m m$

Given That, we have to convert $3$ $m$ $40$ $c m$ to $m i l l i m e t e r$

$40$ $c m = 10 \times 40$ $m m$

$= 400$ $m i l l i m e t e r$
And

$3$ $m = 1000 \times 3$ $m m$

$= 3000$ $m i l l i m e t e r$

$3$ $m$ $40$ $c m$ $= 3 m + 40 c m$

$= 3000 m m + 400 m m$
$= 3400 m m$

So, Option $B$ is correct

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