Ten, matlactli—that is the upper part of the body, or all the fingers of the hands.
Eleven, matlactli oc ce, ten and one.
Twelve, matlactli om ome, ten and two.
Thirteen, matlactli om ey, ten and three.
Fourteen, matlactli o nahui, ten and four. In these names oc, om, o, or on as Molina gives it, seems to be used as a connective particle, equivalent to 'and,' but I am not acquainted with its derivation.
Fifteen, caxtolli, a word to which the authorities give no derivative meaning.
Sixteen, caxtolli oc ce, fifteen and one, etc.
Twenty, cem pohualli, once twenty. The word pohualli means 'a count,' the number twenty being in a sense the foundation of the whole numerical system.
Twenty-one, cem pohualli oc ce, once twenty and one, etc.
Thirty, cem pohualli, ihuan (or om as Molina has it) matlactli, once twenty and ten.