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There are 10 mm to a cm so just times the number by ten, so 420mm = 4.2cm :)
6.3 centimeters equals 63 mm.
63 mm
84 mm ;-)
6,800 mm
three hundred mm.
1000 mm equals one meter
1.5 cm equals 15 mm.
1 km equals 100,000 mm
15 mm
457.2 mm.
It equals 35 mm.
419 mm
About 66 mm (65.99).