42 decimeters in kilometers

Conversion formula
How to convert 42 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: 42 ⁢ dm = 0.004200000000000001 ⁢ km

Conversion in the opposite direction

The inverse of the conversion factor is that 1 kilometer is equal to 238.095238095238 times 42 decimeters.

It can also be expressed as: 42 decimeters is equal to $\frac{1}{\mathrm{238.095238095238}}$ kilometers.

Approximation

An approximate numerical result would be: forty-two decimeters is about zero kilometers, or alternatively, a kilometer is about two hundred and thirty-eight point zero nine times forty-two decimeters.