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deca- 80 octaconta- 11 undeca- 90 nonaconta- 12 dodeca- 100 hecta- 13 trideca- 200 dicta- 14 tetradeca- 300 tricta- 15 pentadeca- 400 tetracta- 16 hexadeca- 500 pentacta- 17 heptadeca- 600 hexacta- 18 octadeca- 700 heptacta- 19 nonadeca- 800 octacta- 20 icosa- 900 nonacta- 21 henicosa- 1000 kilia- 22 docosa- 2000 dilia- 23 tricosa- 3000 trilia- 24
Hecto (symbol: h) is a decimal unit prefix in the metric system denoting a factor of one hundred. It was adopted as a multiplier in 1795, and comes from the Greek ἑκατόν hekatón, meaning "hundred".
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The prefixes deci-and centi-, and less frequently hecto-and deca-, are generally used for informal purposes; the centimetre (cm) is especially common. Some modern building codes require that the millimetre be used in preference to the centimetre, because "use of centimetres leads to extensive usage of decimal points and confusion". [ 10 ]
For the hundreds, there are competing forms: Those in -gent-, from the original Latin, and those in -cent-, derived from centi-, etc. plus the prefixes for 1 through 9 . Many of the items in the following tables are not in general use, but may rather be regarded as coinages by individuals.
A unit prefix is a specifier or mnemonic that is added to the beginning of a unit of measurement to indicate multiples or fractions of the units. Units of various sizes are commonly formed by the use of such prefixes.
Prefix Symbol Factor Power tera T 1 000 000 000 000: 10 12: giga G 1 000 000 000: 10 9: mega M 1 000 000: 10 6: kilo k 1 000: 10 3: hecto h 100 10 2: deca da 10 10 1 (none) (none) 1 10 0: deci d 0.1 10 −1 ...
The decanewton is also encountered occasionally, probably because it is an SI approximation of the kilogram-force. Its use is more common in Central Europe . In German, Polish, Czech, Slovak, and Hungarian, deka (or deko ) is common, and used in self-standing form, always meaning decagram .