**Definitions:**

**Millimeter** (abbreviation: **mm**): is a unit of length in the SI metric system, equal to one thousandth of a metre. Therefore, there are thousand millimetres in a metre and ten millimetres in a centimetre.

**Centimeter** (abbreviation: **cm**): is a unit of length in the SI metric system, equal to one hundredth of a metre, centi being the prefix for a factor of 1/100. The centimetre was the base unit of length in the now deprecated centimetre–gram–second (CGS) system of units.

## How to Convert Millimeters to Centimeters

*Example: How many centimeters are equivalent to 6.85 millimeters?*

As;

1 millimeters = 0.1 centimeters

6.85 millimeters = Y centimeters

Assuming Y is the answer, and by criss-cross principle;

Y equals 6.85 times 0.1 over 1

(i.e.) Y = 6.85 * 0.1 / 1 = 0.685 centimeters

Answer is: 0.685 centimeters are equivalent to 6.85 millimeters.

*Practice Question: Convert the following units into cm:*

N.B.: After working out the answer to each of the next questions, click adjacent button to see the correct answer.

( i ) 80.57 mm

( ii ) 96.23 mm

( iii ) 72.26 mm