to convert 30mm into cm multiply the 30mm by 10. this is because there are 10mm to a cm.
30mm 3 centimeters = 1.18110236 inches
30mm is 3cm (divide mm by 10)
3cm = 30mm.
3cm = 30mm
3.4 cm is equal to 340 mm so 3.4 cm is largest.
1mm = 0.1cm 30 mm = 0.3 cm
1mm = 0.1 cm 10mm= 1cm so 30mm = 3cm