21 meters in decimeters

Conversion formula
How to convert 21 meters to decimeters?

We know (by definition) that: $1\mathrm{m}=10\mathrm{dm}$

We can set up a proportion to solve for the number of decimeters.

Now, we cross multiply to solve for our unknown $x$:

Conclusion: 21 ⁢ m = 210 ⁢ dm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 decimeter is equal to 0.00476190476190476 times 21 meters.

It can also be expressed as: 21 meters is equal to $\frac{1}{\mathrm{0.00476190476190476}}$ decimeters.

Approximation

An approximate numerical result would be: twenty-one meters is about two hundred and ten decimeters, or alternatively, a decimeter is about zero times twenty-one meters.