By multiplying by a conversion factor. 1km=1 x 103 m, the conversion factor here being 103.
There isn't any one general answer. It depends on what unit you want to convert to what other unit.
I not a metric unit of anything! A litre is one metric unit for volume.
The conversion factor for changing one unit of length to another in the metric system is a multiple of 10, as the metric system is based on the power of 10. This means that to convert from one unit of length to another, you simply need to multiply or divide by 10 or its multiples such as 100, 1000, etc.
kilometers
Metric unit is easy. Costomary unit is an advanced unit
To convert from one metric unit to another, use conversion factors. Multiply the value you are converting by the appropriate conversion factor to get the desired unit. For example, to convert meters to centimeters, multiply by 100 since there are 100 centimeters in one meter.
One degree on the Celsius scale is equivalent to one Kelvin in the metric unit of temperature.
move the decimal point the the correct spot
It is conversion using multiples of integral powers of 10.
The metric unit of time is the second.There isn't one in common use but:10 metric hours in a day100 metric minutes in a metric hour100 metric seconds in a metric minute10 days in a metric week (called a dekade)
There is no individual unit in the Metric system that is near one inch in the English system, I'm afraid.
"Mg" is a metric unit. It's 0.001 gram.