Cardinal numerals:

One, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve

Ordinal numerals:

Extended information on First, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth

Rules for changing cardinal numerals:

① For ordinal numerals, add -th to the end of the word.

②One, two, and three must be remembered specially. The last letters of the word are t, d, and d.

③Eight removes t, nine removes e, ve needs to be replaced by f, ty changes y into i, and there is an e in front of th.

④When encountering dozens, the first is the cardinal number, and the last is the ordinal number.