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Empty numbers are sometimes made up, with obvious meaning: "squillions" is obviously an empty, but very large, number; a "squintillionth" would be a very small number. Some empty numbers may be modified by actual numbers, such as "four zillion", and are used for jest, exaggeration, or to relate abstractly to actual numbers.
Fractions as modifiers are hyphenated: "two-thirds majority", but if numerator or denominator are already hyphenated, the fraction itself does not take a hyphen: "a thirty-three thousandth part". (Fractions used as nouns have no hyphens: "I ate two thirds of the pie.") Comparatives and superlatives in compound adjectives also take hyphens:
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)."
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.”
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).
The hyphen-minus symbol (-) is the form of hyphen most commonly used in digital documents. On most keyboards, it is the only character that resembles a minus sign or a dash so it is also used for these. [27] The name hyphen-minus derives from the original ASCII standard, [28] where it was called hyphen–(minus). [29]
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
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 ...