(1) From the first to the nineteenth, one-first, two-second, three-third, five-fifth, eight-eighth, nine-ninth and twenty-eighth are special forms, and other ordinal numbers are all formed by adding "th" after their corresponding cardinal words. For example: 66, 19-19 ..

(2) From the 20th to the 90th integer, the decimal form is to change the ending letter Y to I, and add "eth" before its corresponding cardinal word.

Twenty-twenty-three-thirty

When the decimal system is expressed, it is expressed in the form of decimal cardinal words plus hyphen "-"and unit ordinal number. Thirty-first thirty-first fifty-sixth fifty-sixth seventy-third ninety-ninth ninety-ninth ninety-ninth