A centimetre exceeds a millimetre in length. The metric system equates 1 centimetre to 10 millimetres. One can determine the answer by comparing both of these measurements to the metre.
Using a metric conversion table, one discovers that one centimetre equals one hundredth of a metre. Similarly, 1 millimetre is equivalent to 1/1,000 of a metre. Obviously, a centimetre is larger than a millimetre.
To compare in inches, one can alternatively convert from the metric system to the imperial system. Using conversion tables, one may determine that 1 centimetre is equivalent to 0.3937 inches and 1 millimetre is equivalent to 0.03937 inches. The comparison also demonstrates that a centimetre is larger.