Prefix	Meaning
Mono	one
Di	two
Tri	three
Tetra	four
Penta	five
Hexa	six
Hepta	seven
Octa	eight
Nona	nine
Deca	ten

Prefix	Meaning
meth	methyl (one carbon)
eth	ethyl (two carbons)
prop	propyl (three carbons)
but	butyl (four carbons)
pent	pentyl (five carbons)