The prefix that means one-hundredth is centi- (as in centimeter, or .01 of a meter). Wikipedia has all the answers, please look at the link for more information.
In math 1/100 is more commonly used than one-hundredth. (just thought it would help.)
centi-
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"Centi-" usually means "one hundredth of". One centimeter (cm) is 1/100 of a meter, and similarly one centiliter (cl) is one hundredth of a litre. However, centiliters are rarely used, as most volume units are in milliliters instead (1cl = 10ml).
Centi
centi, deci, and milli.as in centimeter, decimeter, and millimeteransw2. Strictly, they are not prefixes, they are the multiples and sub multiples as are approved by the International Bureau of Weights and Measures.
There is no special SI prefix for the number 3.
The prefix is milli, abbreviated "m".