Ordinal Numbers List
1st
first
2nd
second
3rd
third
4th
fourth
5th
fifth
6th
sixth
7th
seventh
8th
eighth
9th
ninth
10th
tenth
11th
eleventh
12th
twelfth
13th
thirteenth
14th
fourteenth
15th
fifteenth
16th
sixteenth
17th
seventeenth
18th
eighteenth
19th
nineteenth
20th
twentieth
21st
twenty-first
22nd
twenty-second
23rd
twenty-third
30th
thirtieth
40th
fortieth
50th
fiftieth
60th
sixtieth
70th
seventieth
80th
eightieth
90th
ninetieth
100th
hundredth
101st
hundred and first
200th
two hundredth
1000th
thousandth
1,000,000th
millionth
10,000,000th
ten millionth
1,000,000,000th
billionth
We normally just add a -th to the end of number to make it ordinal. Except for 1, 2, and 3. The have the endings -st, -nd, and -rd (1st, 2nd, 3rd). Keep in mind that the tens ending in zero adopt the ending -ieth.