The Greek numerical prefixes are used for naming things like polygons, polyhedra and polynomials::
- mono = 1
- di = 2
- tri = 3
- tetra = 4
- penta = 5
- hexa = 6
- hepta = 7
- octa = 8
- ennea = 9
- deca = 10
- hendeca = 11
- dodeca = 12
- triskaideca = 13
- tetrakaideca...enneakaideca = 14...19
- icosa = 20
- icosikaihena = 21
- icosidi...icosiennea = 22...29
- triaconta = 30
- tetraconta...enneaconta = 40..90
- hecto | hecato = 100
- chilia = 1000
- myria = 10000
The word "kai", meaning and, is often omitted. Chemistry uses a slightly different set of prefixes, two of which come from latin::
And the rest of which are pretty much made up::
- henicosa = 21
- docosa...nonacosa = 22...29
- hentriaconta...nonatriaconta = 31...39
- kilia = 1000
- dilia...nonalia = 2000...9000
And, finally, for large numbers these prefixes are used:
- bi = 2
- tri = 3
- quadra = 4
- quinta = 5
- sexta = 6
- septa = 7
- octo = 8
- nona = 9
- deca = 10
- undeca = 11
- dodeca = 12
- tredeca = 13
- quattuordeca = 14
- quinquedeca = 15
- sexdeca = 16
- septendeca = 17
- octodeca = 18
- novemdeca = 19
- viginti = 20
- unviginti...novemviginti = 21...29
- triginti = 30
Some of these suffices need checking, since these are not quite the latin names of the numbers...but in the actual compounds (e.g. octillion, vigintillion) they disappear.
See also ReallyBigNumbers
Numerical Prefixes