How to convert ordinal numerals to (US) American English words, how to write them down using letters instead of numerals
How to write ordinal numbers (those denoting order) down in words?
Most ordinal numbers end in "th", so just add "th" to the end of the cardinal number (those denoting quantity, ex: 1 one, 2 two, 3 three, 4 four, ... etc.):
- cardinal: 4 = four -> ordinal: 4th = fourth
- cardinal: 7 = seven -> ordinal: 7th = seventh
- cardinal: 10 = ten -> ordinal: 10th = tenth
- cardinal: 19 = nineteen -> ordinal: 19th = nineteenth
- cardinal: 100 = one hundred -> ordinal: 100th = (one) hundredth
- cardinal: 1,000 = one thousand -> ordinal: 1,000th = (one) thousandth
Exceptions:
- cardinal: 1 = one -> ordinal: first = 1st
- cardinal: 2 = two -> ordinal: second = 2nd
- cardinal: 3 = three -> ordinal: third = 3rd
- cardinal: 5 = five -> ordinal: fifth = 5th
- cardinal: 8 = eight -> ordinal: eighth = 8th
- cardinal: 9 = nine -> ordinal: ninth = 9th
- cardinal: 12 = twelve -> ordinal: twelfth = 12th
- cardinal: 20 = twenty -> ordinal: twentieth = 20th
- cardinal: 30 = thirty -> ordinal: thirtieth = 30th
- cardinal: 40 = forty -> ordinal: fortieth = 40th
- cardinal: 50 = fifty -> ordinal: fiftieth = 50th
- cardinal: 60 = sixty -> ordinal: sixtieth = 60th
- cardinal: 70 = seventy -> ordinal: seventieth = 70th
- cardinal: 80 = eighty -> ordinal: eightieth = 80th
- cardinal: 90 = ninety -> ordinal: ninetieth = 90th
Full article: how to write ordinal numbers out in (US) American English words, using letters instead of numerals
Here there are a couple of the main ordinal numbers, from 1st up to 19th, you can find a longer list in the full article:
- cardinal: 1 = one;
ordinal: 1st = first; - cardinal: 2 = two;
ordinal: 2nd, second; - cardinal: 3 = three;
ordinal: 3rd, third; - cardinal: 4 = four;
ordinal: 4th, fourth; - cardinal: 5 = five;
ordinal: 5th, fifth; - cardinal: 6 = six;
ordinal: 6th, sixth; - cardinal: 7 = seven;
ordinal: 7th, seventh; - cardinal: 8 = eight;
ordinal: 8th, eighth; - cardinal: 9 = nine;
ordinal: 9th, ninth; - cardinal: 10 = ten;
ordinal: 10th, tenth; - cardinal: 11 = eleven;
ordinal: 11th, eleventh; - cardinal: 12 = twelve;
ordinal: 12th, twelfth; - cardinal: 13 = thirteen;
ordinal: thirteenth; - cardinal: 14 = fourteen;
ordinal: 14th, fourteenth; - cardinal: 15 = fifteen;
ordinal: 15th, fifteenth; - cardinal: 16 = sixteen;
ordinal: 16th, sixteenth; - cardinal: 17 = seventeen;
ordinal: 17th, seventeenth; - cardinal: 18 = eighteen;
ordinal: 18th, eighteenth; - cardinal: 19 = nineteen;
ordinal: 19th, nineteenth;