490 decimeters in kilometers

Conversion formula
How to convert 490 decimeters to kilometers?

We know (by definition) that: $1\mathrm{dm}=0.0001\mathrm{km}$

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

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

Conclusion: 490 ⁢ dm = 0.049 ⁢ km

Conversion in the opposite direction

The inverse of the conversion factor is that 1 kilometer is equal to 20.4081632653061 times 490 decimeters.

It can also be expressed as: 490 decimeters is equal to $\frac{1}{\mathrm{20.4081632653061}}$ kilometers.

Approximation

An approximate numerical result would be: four hundred and ninety decimeters is about zero point zero five kilometers, or alternatively, a kilometer is about twenty point four one times four hundred and ninety decimeters.