Answer :

Sure, let's convert 120 millimeters to centimeters step by step.

1. Understand the conversion factor:
- We know that 1 centimeter is equal to 10 millimeters.

2. Set up the conversion:
- To convert millimeters to centimeters, you divide the number of millimeters by the number of millimeters in a centimeter (which is 10).

3. Perform the conversion:
- So, to convert 120 millimeters to centimeters, you take 120 and divide it by 10.

[tex]\[ \frac{120 \, \text{millimeters}}{10} = 12 \, \text{centimeters} \][/tex]

4. Conclusion:
- Therefore, 120 millimeters is equal to 12.0 centimeters.

So, the converted value is 12.0 centimeters.