To convert from a larger unit to a smaller unit you would multiply.
Ex: 5 km = 5000 m
Where 1 km = 1000 m
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It depends on which factor you are multiplying or dividing by. It can go either way. To convert from ounces to grams, for instance, you can divide by 28.350, or you can multiply by 0.035273.
Divide
multiply
divide
You divide the numbers.
you divide or multiply
You must divide.
to get a unit
You divide the numbers.
That depends on what you are converting from. If you are converting from larger units, you multiply. If you are converting from smaller units, you divide.
multiply
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.
When going from larger to smaller measurements, there will be more of them so it is necessary to multiply. 1 meter = 100 centimeters When going from smaller to larger measurements, there will be fewer of them so it is necessary to divide. 100 centimeters = 1 meter