4 decimeters in centimeters

Conversion formula
How to convert 4 decimeters to centimeters?

We know (by definition) that: $1\mathrm{dm}=10\mathrm{cm}$

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

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

Conclusion: 4 ⁢ dm = 40 ⁢ cm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 centimeter is equal to 0.025 times 4 decimeters.

It can also be expressed as: 4 decimeters is equal to $\frac{1}{\mathrm{0.025}}$ centimeters.

Approximation

An approximate numerical result would be: four decimeters is about zero centimeters, or alternatively, a centimeter is about zero point zero three times four decimeters.