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multiply
By subtraction. For example 2 - 1 = 1
You convert to a larger unit. Smaller to larger. Metre is 1000 times larger than a millimetre
You multiply however many bigger units you have by the number of smaller units per bigger unit. For example: If you wish to convert 3 metres to centimetres then you multiply 3 by 100 (as there are 100 centimetres in a metre) to result in 300cm.
The number of larger units is less than the number of smaller ones. EX: 130 cm == 1.3 m; 130 centimeters converts to 1.3 meters.