Final answer:
There are 32.0 millimeters in 3.20 centimeters. This is calculated using the conversion factor of 10 mm per 1 cm, resulting in multiplying 3.20 cm by 10.
Step-by-step explanation:
To answer the question, how many millimeters are in 3.20 centimeters, one must use a conversion factor. The conversion factor from centimeters to millimeters is that there are 10 mm in 1 cm. Therefore, to convert 3.20 cm to mm, we multiply by the conversion factor:
3.20 cm × (10 mm / 1 cm) = 32.0 mm
This is because each centimeter is equivalent to 10 millimeters. So for the group of answer choices given, the correct choice would be 3.20 × 101 mm.