421 decimeters in kilometers

Conversion formula
How to convert 421 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: 421 ⁢ dm = 0.042100000000000005 ⁢ km

Conversion in the opposite direction

The inverse of the conversion factor is that 1 kilometer is equal to 23.7529691211401 times 421 decimeters.

It can also be expressed as: 421 decimeters is equal to $\frac{1}{\mathrm{23.7529691211401}}$ kilometers.

Approximation

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