Well, There are 10 mm in 1 cm, so 10 times 30 is 300
300 mm are in 30 cm
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30 mm equals 3 cm. To convert millimeters to centimeters, divide the number of millimeters by 10.
30 mm 1 cm = 10 mm 1 mm = 0.1 cm
30 cm is equal to 300 mm.
acc to science and maths , 1 cm-10 mm 3 cm=30 mm