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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
Divide by the conversion factor to get the equivalent value in the smaller unit.
Because, for any given amount, there are fewer larger units that will go into that amount.
You convert to a larger unit. Smaller to larger. Metre is 1000 times larger than a millimetre
To convert a given unit to a larger unit, you need to determine the conversion factor between the two units. Divide the given value by the conversion factor to get the answer in the larger unit.
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.