Numbers and Percentages - AMA Manual of Style

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Numbers and Percentages 

Numbers and Percentages

Chapter:
Numbers and Percentages
Author(s):

Stephen J. Lurie

and Margaret A. Winker

DOI:
10.1093/jama/9780195176339.003.0019
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Any policy on the use of numbers in text must take into account the reader’s impression that numbers written as numerals (symbols) appear to emphasize quantity more strongly than numbers spelled out as words. Because numerals convey quantity more efficiently than spelled-out numbers, they are generally preferable in technical writing. In literary writing, by contrast, spelled-out numbers may be more compatible with style. Despite these general principles, usage may appear inconsistent when a publication chooses to use numerals in some instances and words in others. The guidelines outlined in this section attempt to reduce these inconsistencies and avoid use of numerals that may be jarring to the reader. In situations that are not governed by these guidelines, common sense and editorial judgment should prevail.

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