Should Three-Quarters Be Hyphenated?

Fractions should always be hyphenated when they are adjectives or adverbs, as in They got a one-third share and The money is three-quarters gone. ... One can think of the hyphen as representing the division bar in a fraction in figures. The horse rounded the track five and three-quarters times.

Should one quarter be hyphenated?

Fractions are almost always hyphenated when they are adjectives: “He is one-quarter Irish and three-quarters Nigerian.” But when the numerator is already hyphenated, the fraction itself is not, as in “ninety-nine and forty-four one hundredths.” Fractions treated as nouns are not hyphenated: “He ate one quarter of the ...

Is three-quarters a compound word?

(Here, "three-quarter" is hyphenated because that's how a fraction is written in full.) It doesn't matter how complicated your number is, if it's a quantifier to a noun, then it is not hyphenated.