In metric system of measurement the prefix 'milli' is used to denote one-thousandth. Thus 1 millimeter is one-thousandth of 1 meter, and 1 milligram is one-thousandth of 1 gram.
The metric system of measurement has standard prefixes for quantities which represent place value of number in decimal system. More common of of these prefixes and their values are given below:
Kilo - 1000
Hecto - 100
Deca - 10
Deci -1/10
Centi - 1/100
Milli - 1/1000
With the need to represent much larger and much smaller quantities many additional prefixes of this type are now used. For example:
Mega - 1000,000
Micro - 1/1000,000
Nano - 1/1000,000,000
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