Ordinal Numbers

We use ordinal numbers to talk about the "order" of things or to define a thing's position in a series.

first	1st
second	2nd
third	3rd
fourth	4th
fifth	5th
sixth	6th
seventh	7th
eighth	8th
ninth	9th
tenth	10th
eleventh	11th
twelfth	12th
thirteenth	13th
fourteenth	14th
fifteenth	15th
sixteenth	16th
seventeenth	17th
eighteenth	18th
nineteenth	19th
twentieth	20th
twenty-first	21st
twenty-second	22nd
twenty-third	23rd
twenty-fourth	24th
thirtieth	30th
thirty-first	31st
fortieth	40th
fiftieth	50th
sixtieth	60th
seventieth	70th
eightieth	80th
ninetieth	90th
hundredth	100th
hundred and first	101st
hundred and fifty-second	152nd
two hundredth	200th
thousandth	1,000th
millionth	1,000,000th
billionth	1,000,000,000th
trillionth	1,000,000,000,000t