Writing numbers properly can be tricky. There are a few things to keep in mind.

Remember that you should use a hyphen only in compound numbers between 21 and 99. Don’t use a hyphen when numbers are greater than 99. So you should write:

  • thirtythree
  • one hundred and thirtythree
  • five thousand and seventynine

You should not write:

  • seven-hundred
  • one-hundred and thirty-three
  • five-thousand and seventy-nine

Those hyphens are incorrect because they appear in numbers greater than 99.

The use of “and” is also tricky. In British English we always use “and” between hundred/thousand/million/etc and numbers below 100. As in:

  • seven hundred and five
  • two million and ten
  • six thousand, five hundred and nine

In American English it is acceptable to omit “and.” As in:

  • seven hundred five
  • two million ten

I wonder, though, if the British “and” is becoming more common among American speakers and writers.

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