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After "nine", one can head straight back into the 10, 11, 12, etc., although some write out the numbers until "twelve". Example: "I have 28 grapes." (Preferred) Example: "I have twenty-eight grapes." Another common usage is to write out any number that can be expressed as one or two words, and use figures otherwise. Examples:
Numbers in mathematical formulae are never spelled out (3 < π < 22 / 7 not three < pi < twenty-two sevenths), and "numbers as numbers" are rarely spelled out in other mathematical contexts (the first three primes are 2, 3, and 5 not the first three primes are two, three, and five; but zero-sum game and roots of unity).
While we currently have the manual say spelling out numbers up to 10, I propose that we at least in one sentence explain the standard formal English usage of spelling out numbers up to 100. I was asked by an editor "why spell out "fifty" and not "five hundred and sixty-two" and responded that it was formal English practice because it was ...
For example, if your check is for $19.99, you would write it out as “Nineteen and 99/100.” ... Knowing how to write numbers in words on a check is even more important if you write larger checks.
Spell out large numbers beginning sentences (Thirty days hath September . . .). Spell out numbers which are inexact, or below 10 and not grouped with numbers over 10 (one-tailed t test, eight items, nine pages, three-way interaction, five trials). Use numerals for numbers 10 and above, or lower numbers grouped with numbers
An even number is an integer that is "evenly divisible" by two, that is divisible by two without remainder; an odd number is an integer that is not even. (The old-fashioned term "evenly divisible" is now almost always shortened to "divisible".) Any odd number n may be constructed by the formula n = 2k + 1, for a suitable integer k.
Such a number is algebraic and can be expressed as the sum of a rational number and the square root of a rational number. Constructible number: A number representing a length that can be constructed using a compass and straightedge. Constructible numbers form a subfield of the field of algebraic numbers, and include the quadratic surds.
(Both, by the way recommend spelling out numbers up to one hundred, though they also recognize that in some types of works—scientific, financial—the "spell out only up to ten" rule may apply.) When, however, numbers referring to different categories of things occur in a passage, the numbers in each category may be treated differently.