9 millimeters in centimeters

Conversion formula
How to convert 9 millimeters to centimeters?

We know (by definition) that: $1\mathrm{mm}=0.1\mathrm{cm}$

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

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

Conclusion: 9 ⁢ mm = 0.9 ⁢ cm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 centimeter is equal to 1.11111111111111 times 9 millimeters.

It can also be expressed as: 9 millimeters is equal to $\frac{1}{\mathrm{1.11111111111111}}$ centimeters.

Approximation

An approximate numerical result would be: nine millimeters is about zero centimeters, or alternatively, a centimeter is about one point one one times nine millimeters.