# How can you convert centimeters to millimeters?

To do any conversion, you find the relationship between the two units.

In this case,

##”100 cm” = “1 m”## and ##”1000 mm” = “1 m”##

Therefore

##”100 cm” = “1000 mm”## or ##”1 cm” = “10 mm”##

This gives you two conversion factors:

and if you look at the equation, you’ll see that

EXAMPLE

Convert 3.1 cm into millimetres.

You multiply by a conversion factor: ##”1 cm”https://studydaddy.com/”10 mm”## or ##”10 mm”https://studydaddy.com/”1 cm”##.

Choose the one that gives you the correct units for the answer.

##3.1 cancel(“cm”) × “10 mm”/(1 cancel(“cm”)) =” 31 mm”##

Note that the “cm” cancels out and leaves you with the answer in “mm”. If you had chosen the other conversion factor, you would have gotten

##”3.1 cm” × “1 cm”https://studydaddy.com/”10 mm” = “0.31 cm”^2″/mm”##

The strange units for the answer tell you that you have made a mistake.

LAST RESORT

If you can’t remember that ##”1 cm” = “10 mm”##, you can always use the definitions of milli and centi:

##”milli” = 10^-3##; so ##”1 mm” = 10^-3 “m”##
##”centi “= 10^-2##, so ##”1 cm” = 10^-2 “m”##

Then you can convert “cm” to “m” and “m” to “mm”.

##3.1 cancel(“cm”) × (10^(-2) cancel(“m”))/(1 cancel(“cm”)) × “1 mm”/(10^(-3) cancel(“m”)) = “31 mm”##

It’s an extra step, but it always works.

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