Final answer:
To convert centimeters to millimeters, multiply the given measurement by 10 because there are 10 millimeters in 1 centimeter. So, 45 centimeters is equal to 450 millimeters.
Step-by-step explanation:
To convert centimeters to millimeters, you need to multiply the given measurement by 10 because there are 10 millimeters in 1 centimeter. So, to convert 45 centimeters to millimeters:
45 cm * 10 mm/cm = 450 mm
Therefore, 45 centimeters is equal to 450 millimeters.