1.8 cm
1 cm = 10 mm
1 mm = 0.1 cm
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There are 10 mm in one centimeters (cm), so there is 1/10th of a cm in one mm.
2 centimeters is equal to 20 millimeters.
There is 0.1 cm in one mm.
18 centimeters is 18 centimeters.
8 centimeters is equal to 80 mm (1 cm = 10 mm). Adding 80 mm and 6 mm gives a total of 86 mm.