Re: Re: writing numbers??? Home › Forums › Writer’s Digest Forum › Writers’ Block Party › writing numbers??? › Re: Re: writing numbers??? May 30, 2008 at 11:47 pm #458142 wr32Participant One major exception to the rule of AP and CMS is that you should not begin a sentence with a numeral–spell it out. Also, all percentages are written as numerals unless they begin the sentence.