640 meters in decimeters

Conversion formula
How to convert 640 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: 640 ⁢ m = 6400 ⁢ dm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 decimeter is equal to 0.00015625 times 640 meters.

It can also be expressed as: 640 meters is equal to $\frac{1}{\mathrm{0.00015625}}$ decimeters.

Approximation

An approximate numerical result would be: six hundred and forty meters is about six thousand, four hundred decimeters, or alternatively, a decimeter is about zero times six hundred and forty meters.