Deci- is a prefix which is used to mean "one tenth" - for example, a decimetre is a unit of length equal to one tenth of a metre. Also, interestingly, the original meaning of the word "decimate", nowadays meaning "to eliminate in large numbers" originally meant, when referring to Roman soldiers, to "kill one in every ten".
Deca- is a prefix which is used to mean "ten" - using a similar example, a decametre is a unit of length equal to 10 metres. Other words using the prefix deca- include decagon - a ten-sided polygon, and decapod - a ten-legged object.
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A deci is a prefix that means one-tenth (10^-1), while a deca is a prefix that means ten (10^1). In the metric system, a deci is smaller than the base unit, while a deca is larger than the base unit.
kilo, hecto, deka, 1 unit, deci, centi, milli, micro, nano, pico
The prefix that represents hundredths in the metric system is "centi-."
The major prefixes for metric units in order from largest to smallest are kilo-, hecto-, deca-, base unit (gram, liter, meter), deci-, centi-, and milli-.
"KHDUDCM" does not have a specific meaning. It may be a combination of random letters and does not correspond to any commonly known English word or acronym.
Factor Name Symbol1024 yotta Y1021 zetta Z1018 exa E1015 peta P1012 tera T109 giga G106 mega M103 kilo k102 hecto h101 deca da10-1 deci d10-2 centi c10-3 milli m10-6 micro µ10-9 nano n10-12 pico p10-15 femto f10-18 atto a10-21 zepto z10-24 yocto y