micro - one millionth (0.000001)
centi - one hundreth (0.01)
Kilo - one thousand (1,000)
Mega - one million (1,000,000)
milli - one thousandth (0.001)
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Mega = 1,000,000 units
kilo = 1,000 units
centi = 1/100 unit
milli = 1/1,000 unit
micro= 1/1,000,000 unit
Centi- = one hundredth Milli- = one thousandth Micro- = one millionth
Prefixes based on powers of 10 can be used with any SI (metric) unit. Some of the common prefixes are: Deka (10) Hekto (100) deci (1/10) centi (1/100) kilo (1000 Mega (million) milli (1/1000) micro (1/1,000,000)
Please take a look at the Wikipedia article "SI prefixes". There you can see the values of prefixes such as "mega", "kilo", and others. The prefixes are the same for all units. For example, "micro" always means a millionth, whether it is applied to gram, to hertz, to seconds, etc.
They are yocto (septillionth) zepto (sextillionth) atto (quintillionth) femto (quadrillionth) pico (trillionth) nano (billionth) micro (millionth) milli (thousandth) centi (hundredth) deci (tenth) UNIT deca (ten) hecto (hundred) kilo (thousand) mega (million) giga (billion) tera (trillion) peta (quadrillion) exa (quintillion) zetta (sextillion) yotta (septillion).
Some prefixes, which you use with any unit, are:Tera (10 to the power 12)Giga (10 to the power 9)Mega (10 to the power 6)Kilo (10 to the power 3)Hekto (10 to the power 2)Deka (10 to the power 1)Deci (10 to the power -1)Centi (10 to the power -2)Milli (10 to the power -3)Micro (10 to the power -6)Nano (10 to the power -9)Pico (10 to the power -12)You can find a more complete list at the Wikipedia, in the article "SI prefixes".