100 millimeters, 1 decimeter, 0.1 meter, 0.0001 kilometers, etc.
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A decimetre.
10 centimeters equal 1 decimeter.
There are 20 millimeters in 2 centimeters because if there are 10 millimeters in 1 centimeter and this metric system is based on 10 then if you count 10 times 10 it equals 20.
a millimeter equals 10 centimeters, and 10 centimeters equals an inch. so you would take the inches and count the centimeters, then count 10 millimeter per centimeter
millimeter i think that's how you spell it