The metric number prefix is defined as a unit prefix, which precedes a base unit to indicate the multiple or the submultiple of a unit. Some of the metric prefixes are:
Kilo (1000 or 103)
Hecto (100 or 102)
Deca (10 or 101)
Base unit (1)
Deci (1/10 or 10-1)
Centi (1/100 or 10-2)
Milli (1/1000 or 10-3)