No. That principle applies for most unit conversions in the metric system, but not for all and it does not apply at all for imperial measurements.
You convert to a larger unit. Smaller to larger. Metre is 1000 times larger than a millimetre
False - when converting from a larger unit to a smaller unit there will be more of them so you must multiply. What you multiply by depends upon the units, for example converting feet to inches you multiply by 12; converting pounds to ounces you multiply by 16. It is only with the metric system of units where you multiply by a power of 10 to convert a large unit to a smaller unit, for example 2.5 kg is 2500 g (multiply by 1000 or 103).
The answer to that one is going to depend on two things:-- what unit you are converting from-- what unit you are converting to
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.
Divide the larger number by the smaller one. If the answer is an integer, the larger number is a multiple of the smaller.
It could be either, depending on whether you're converting to a larger or smaller unit.
It depends on what they are compared to. In general, factors will be smaller than the number they are compared to, and multiples will be larger. Overall, factors tend to be smaller than multiples, but 20 is a factor of 40 and 10 is a multiple of 5, so there are exceptions.
In the metric system basic units are multiplied or divided by 10 to get larger and smaller units