Respuesta :
Answer:
30 mm
Step-by-step explanation:
1 centimeter (cm) is one hundredth of a meter
1 millimeter (mm) is one thousandth of a meter
Thus one cm is 10 times bigger, so 3cm = 30mm
3cm in to mm is 30, explanation: multiply the length value by 10, centimeters to millimeters you would need to multiply by 10, 3x10= 30 mm!