Very easy, if both are cm cubed, then its the same as how many millimeters in 1 cm. which is 10. So your answer is 10 cubic millimeters. Above answer would give cubic millimetres in one cubic centimetre. There are one million cubic centimetres in a cubic metre, so you need to multply your answer up. Therefore, 10 x 1000000 equals 10,000,000 cubic millimetres in one cubic metre.