1. Length of time: It lasted fifteen years; we were three days on the way; four hours and ten minutes.
2. Amounts or numbers larger than 1,000, if spelled, are expressed thus: One thousand eight hundred and fifty dollars; A. D. eighteen hundred and fifty; number seventeen hundred and twenty-two. But in serial numbers, where even multiples of one thousand occur, use the word “thousand,” as section two thousand and four (not twenty hundred and four); paragraph seven thousand and sixty-nine.
3. When beginning a sentence: Five million dollars’ worth; in other cases, $5,000,000 worth.
4. All amounts beginning sentences or paragraphs, except when, in testimony, an answer begins with a serial or complex number, in which case use figures. Examples:
Q. In what year was that?—A. 1876.
Q. What was the amount involved?—A. $101.50.
Q. How much was the sum?—A. Five (or fifteen, or sixty-seven) dollars.
5. Numbered streets of all cities, except in tabular matter.
6. Regimental numbers of United States Regular or Volunteer Army, as Eighth Infantry, One hundred and ninth Ohio Regiment, Third Massachusetts Cavalry.
7. Sums of money, when they are referred to in a general way, as “four or five millions,” or “I would not contribute one dollar to such a purpose.” [This is not to be construed as meaning round numbers, but simply a general or indefinite statement.]