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.
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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
The decimal would go left. For example: 18.0: Smaller: 1.8 Bigger: 180
If you convert to a common unit - either multiply kilograms by 1000 to convert to grams, or divide grams by 1000 to convert to kilograms - you can compare them, and see which one is bigger.