Combining Numerals and Words - AMA Manual of Style

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Combining Numerals and Words 

Numbers and Percentages

Stephen J. Lurie

and Margaret A. Winker

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PRINTED FROM AMA MANUAL OF STYLE ONLINE ( © American Medical Association, 2009. All Rights Reserved. Under the terms of the license agreement, an individual user may print out a PDF of a single chapter of a title in AMA Manual of Style Online for personal use (for details see Privacy Policy). date: 01 December 2015

Use a combination of numerals and words to express rounded large numbers and consecutive numerical expressions. Rounded large numbers, such as those starting with million, should be expressed with numerals and words.The disease affects 5 million to 6 million people. [Note that the word million is repeated to avoid ambiguity.] The word million signifies the quantity 106, while billion signifies the quantity 109. Although billion has traditionally signified 1012 (1 million million) in Britain, many British medical journals now use billion to indicate the quantity 109. A number may be expressed in million rather than billion if the latter term

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