420 decimeters in kilometers
Result
The conversion result is: 420 decimeters is equivalent to 0.042 kilometers.[1]
Conversion formula
How to convert 420 decimeters to kilometers?
We know (by definition) that: 1 dm = 0.0001 km.
We can set up a proportion to solve for the number of kilometers.
1 dm / 420 dm = 0.0001 km / x km
Now, we cross multiply to solve for our unknown x:
x km = (420 dm / 1 dm) * 0.0001 km → x km = 0.042 km
Conclusion:
420 dm = 0.042 km
Conversion in the opposite direction
The inverse of the conversion factor is that 1 kilometer is equal to 23.8095238095238 times 420 decimeters.
It can also be expressed as: 420 decimeters is equal to 1 / 23.8095238095238 kilometers.
Approximation
An approximate numerical result would be: four hundred and twenty decimeters is about zero point zero four kilometers, or alternatively, a kilometer is about twenty-three point eight zero times four hundred and twenty decimeters.
Footnotes
[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).
Results may contain small errors due to the use of floating point arithmetic.