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
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millimeter
What determines how precise a measurement is
It is precise if it is repeatable.
Unit of measurement 1000 times less than the millimeter is the micrometer. Unit of measurement 1,000,000 times less than the millimeter is the nanometer.
Millimeter is a size measurement; carat is a weight measurement. Take the stone to a local jeweler and ask for its weight.