30 cm. That's about a foot.
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Well, There are 10 mm in 1 cm, so 10 times 30 is 300 300 mm are in 30 cm
30 cm is equal to 300 mm.
10 mm = 1cm 1 in = 2.54 cm 1 in = 25.4 mm
There are 300 millimeters in 30 centimeters.
30 cm is equal to 300 mm because there are 10 millimeters in 1 centimeter.