When you are converting from a unit to the next smaller unit where the difference is a factor of 10:
kilo - hecto,
hecto - deka
deka - unit
unit - deci
deci- centi
centi - milli
Other prefices involve steps of 1000.
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You multiply by 1000.
Multiply by 5280.
Standard conversion factors are available and published and you use these to convert units from one to the other
Multiply by 10
Multiply by 10.