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I usually hear plural come next: One and a half teaspoons of sugar, one-and-a-half pages of data, e.g. Also, you can switch to a singular noun if you reword the phrase: The play went on for another one-and-a-half hours. The play when on for another hour and a half. I found this usage note in Macmillan:
When a number with a fraction is used as a quantifier, it is not hyphenated (e.g., two and half years). If the number is used as a compound adjective or noun, then hyphens should be used (e.g., two-and-a-half-year journey).
Feb 1, 2015 · If the entry is part of a classification: That kid is a one-and-a-half-year-old. If the entry is describing the age of the person: That kid is one and a half years old. Both of these work, and work similarly for whole numbers: That man is a 50-year-old [person]. That man is 50 years old.
Aug 17, 2024 · The meaning of AND A HALF is —used in measurements of time, distance, weight, etc., to indicate one half of the stated unit of measurement. How to use and a half in a sentence.
One-and-a-half definition: <a>One</a> and a half <a>parts</a> of anything that may be <a>divided</a>, or considered as divided.
Even the Yahoo! style guide requires you write one-quarter, although it (interestingly) absolutely refuses to provide a ruling on how to write out numbers like "1 1/2". But in dialog or quoted speech, such as "five and a half" - none of these references offer guidance.
While one-and-a-half million is correct, it sounds awkward and I daresay it is less commonly used. In regular conversation, one would probably hear one-point-five million, instead. With the indefinite article, the half usually comes after the million: a million and a half.
