12 mm. 12 mm.
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1 cm is bigger (there are 1,000 milimeters in a centimeter)
The metric measurement cm is bigger than mm (they are ten times bigger). cm = centimeter (1/100th of a meter) mm = millimeter (1/1000th of a meter)
There are 100 cm in a meter. There are 1000 mm in a meter. So 1 mm is .1 cm. 12 mm would 12 times more or 1.2 cm.
12 mm. For there are 10 mm in 1 cm.