99 + 1 = 100cm
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A centimetre is exactly one centimetre in length - by definition!
There are 10 millimetres in one centimetre. Therefore, 1 millimetre is equal to one tenth of a centimetre, or 0.1 centimetres.
One centimetre is a hundredth of a metre.
There are 10 millimetres in one centimetre. Therefore, 20.4 centimeters is equal to 20.4 x 10 = 204 millimetres.
There are 100000000 angstroms in one centimetre. Therefore, one angstrom is equal to 1/100000000 = 0.00000001 centimetres.