uni- / mon-, mono-
One
duo-, du- / dy-, dyo-
Two
tri- / tri-
Three
quadri-, quadr- / tetr-, tetra-
Four
quinqu- / pent-, penta-
Five
sex- / hex-, hexa-
Six
sept-, septi- / hept-, hepta-
Seven
octo- / oct-, octa-, octo
Eight
novem-, noven- / ennea-
Nine
deca-, decem- / dek-, deka-
Ten
semi- / hemi-
One half
sesqui-
One and one half
centi-, cent- / hect-, hecto-, hecato-
One hundred
milli-, mill- / kilo-
One thousand
centi-
One hundredth
milli-
One thousandth
primi- / prot-, proto-
First
secundi- / deut-, deuto-, deutero-
Second
tert-
Third
quart-
Fourth
quint-
Fifth
non-, nona-
Ninth
di-, dis- / di
Twice, duplication