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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).
Oxford Style Manual (2003), 5.10.5: "Use hyphens in spelt-out numbers from twenty-one to ninety-nine (twenty-three, thirty-fourth, four hundred and sixty-eight, fifty-three thousand), and in fractions, unless the numerator and the denominator are already hyphenated (one-half, two-thirds, three thirty-seconds, four and five-eights)."
When reading numbers in a sequence, such as a telephone or serial number, British people will usually use the terms double followed by the repeated number. Hence 007 is double oh seven. Exceptions are the emergency telephone number 999, which is always nine nine nine and the apocalyptic "Number of the Beast", which is always six six six.
Hyphenate all numbers under 100 that need more than one word. For example, $73 is written as “seventy-three,” and the words for $43.50 are “Forty-three and 50/100.”
9.9.2.3 Instead of a hyphen, use an en dash when applying a prefix or suffix to a compound that itself includes a space, dash or hyphen 9.9.2.4 To separate parts of an item in a list 9.9.3 Other uses for en dashes
The hyphen ‐ is a punctuation mark used to join words and to separate syllables of a single word. The use of hyphens is called hyphenation. [1]The hyphen is sometimes confused with dashes (en dash –, em dash — and others), which are wider, or with the minus sign −, which is also wider and usually drawn a little higher to match the crossbar in the plus sign +.
A hyphen is not a dash. Hyphens are used within words or to join words, but not in punctuating the parts of a sentence. Use an en dash (–) with before and a space after; or use an em dash (—) without spaces. See Wikipedia:How to make dashes. Avoid using two hyphens (--) to make a dash; and avoid using a hyphen for a minus sign. read ...
[citation needed] There are also a large number of exceptions, which further complicates matters. [citation needed] Some rules of thumb can be found in the Major Keary's "On Hyphenation – Anarchy of Pedantry." [3] Among the algorithmic approaches to hyphenation, the one implemented in the TeX typesetting system is widely used.