You convert to a larger unit. Smaller to larger. Metre is 1000 times larger than a millimetre
The answer to that one is going to depend on two things:-- what unit you are converting from-- what unit you are converting to
to get a unit
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conversion factor
you divide or multiply
You convert to a larger unit. Smaller to larger. Metre is 1000 times larger than a millimetre
Decagram if going from larger unit to smaller unit, and decigram if from smaller to larger.
The answer to that one is going to depend on two things:-- what unit you are converting from-- what unit you are converting to
to get a unit
divide
you divide the smaller # into the bigger #----
Multiply
If the numerator is money then the smaller unit rate is better. If the denominator is the money, then the larger unit rate.
It makes sense to multiply when converting measurements to smaller units because it takes many smaller units to make up a larger unit. So in order to translate larger unit(s) into smaller units, you have to break up the larger unit(s) into many smaller pieces.
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Because the number of larger units will be less than the number of smaller units, and when you divide the answer is usually smaller than the number you started with.