Hyphenate all the numbers between 21 and 99 no matter where they appear within the whole number. Don’t hyphenate 30, 40, 50, 60, 70, 80 and 90.
- 41
forty-one - 256
two hundred and fifty-six - 1,267
one thousand two hundred and sixty-seven
(no comma in the word version) - 64,102
sixty-four thousand one hundred and two - 32,223
thirty-two thousand two hundred and twenty-three - 22,241,890
twenty-two million two hundred and forty-one thousand eight hundred and ninety
