8. Isolated fractions not connected with whole numbers, as one-fourth, three-tenths.
9. Isolated enumerations less than 10: “I saw three men at work.” “There were four horses in the field.”
10. Number of persons, when not in statistical matter or when general or indefinite: “There were thirty or forty persons in the town.”
11. When numbers are mentioned casually, or by way of illustration, or in connection with serious and dignified subjects, they should be spelled out:
In nine hundred and ninety-nine cases out of every thousand.
It is now five years since I first took my stand in opposition to this measure, and if my stay among you should be extended to twenty years instead of five, I shall still be found opposing it with the same earnestness as at first.
Millions for defense, but not one cent for tribute.
The twelve Apostles.
The three Graces.