Question

Convert $4cm38m$ into decimeters.

• A. $384dm$
• B. $380.4dm$
• C. $420dm$
• D. $38.04dm$

Answer 1

The correct option is B $380.4dm$

We know that, $1$ $decimeter=10$ $cm$, $1$ $meter=10$ $dm$ or $1$ $centimeter=\frac{1}{10}$ $dm$

To convert $4$ $cm$ $38$ $m$ to $decimeter$

$4cm$ $38$ $m$ $=4cm+38m$

Now, $38$ $m=10\times 38$ $dm$ $=380$ $dm$

$4$ $cm=\frac{1}{10}\times 4$ $dm$ $=0.4$ $dm$

$4cm$ $38$ $m$ $=4cm+38m=(0.4+380)dm$ $=380.4$ $dm$

So, Option $B$ is correct