45 centimeters in millimeters

Conversion formula
How to convert 45 centimeters to millimeters?

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

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

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

Conclusion: 45 ⁢ cm = 450 ⁢ mm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 millimeter is equal to 0.00222222222222222 times 45 centimeters.

It can also be expressed as: 45 centimeters is equal to $\frac{1}{\mathrm{0.00222222222222222}}$ millimeters.

Approximation

An approximate numerical result would be: forty-five centimeters is about four hundred and fifty millimeters, or alternatively, a millimeter is about zero times forty-five centimeters.