42 centimeters in millimeters

Result

The conversion result is: 42 centimeters is equivalent to 420 millimeters.^[1]

Conversion formula
How to convert 42 centimeters to millimeters?

We know (by definition) that: 1 cm = 10 mm.

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

1 cm / 42 cm = 10 mm / x mm

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

x mm = (42 cm / 1 cm) * 10 mm → x mm = 420 mm

Conclusion:

42 cm = 420 mm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 millimeter is equal to 0.00238095238095238 times 42 centimeters.

It can also be expressed as: 42 centimeters is equal to 1 / 0.00238095238095238 millimeters.

Approximation

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