Convert $12 d m$ into millimeters.

1200 m m

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120 m m

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12 m m

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1.2 m m

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Solution

The correct option is A $1200 m m$
We know that
$m m = m i l l i m e t e r$

$1$ $d e c i m e t e r = 10$ $c m$

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

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

$12$ $d m = 12 \times 100$ $m m$

$= 1200$ $m i l l i m e t e r$

So, Option $A$ is correct

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