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Whole Numbers and Cardinal Numbers: 10 to 99
Numbers from 11 through 19 are:
11 eleventh
12 twelth
13 thirteenth
14 fourteenth
15 fifteenth
16 sixteenth
17 seventeenth
18 eighteenth
19 nineteenth
Numbers from 20 through 29 are:
20 twentieth
21 twenty-first 22 twenty-second 23 twenty-third 24 twenty-forth 25 twenty-fifth 26 twenty-sixth 27 twenty-seventh 28 twenty-eighth 29 twenty-ninth
Numbers from 30 through 90, counting by tens, are:
30 thirtieth 40 fortieth 50 fiftieth 60 sixtieth 70 seventieth 80 eightieth 90 ninetieth
We note that fourth is written with a u but fortieth is written without a u.
We write 31 as thirty-first. We write 85 as eighty-fifth.
Two-digit numbers are called tens.
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