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• 18.0 Numbers and Percentages
• 18.7 Forms of Numbers.
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## Decimals.

### in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year:
Feb 2020
Published Online:
Feb 2020
DOI:
10.1093/jama/9780190246556.003.0018.022.0016
Item type:
section
The decimal form should be used when a fraction is given with an abbreviated unit of measure (eg, 0.5 g, 2.7 mm) to reflect the precision of the measurement (eg, 38.0 kg should not be rounded to 38 kg if the scale was accurate to tenths of a kilogram) (...

## Percentages.

### in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year:
Feb 2020
Published Online:
Feb 2020
DOI:
10.1093/jama/9780190246556.003.0018.022.0017
Item type:
section
The term percent derives from the Latin per centum, meaning by the hundred or in, to, or for every hundred. The term percent and the symbol % should be used with specific numbers. Percentage is a more general term for any number or amount that can be stated as a percent. ...

## Reporting Proportions and Percentages.

### in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year:
Feb 2020
Published Online:
Feb 2020
DOI:
10.1093/jama/9780190246556.003.0018.022.0018
Item type:
section
Whenever possible, proportions and percentages should be accompanied by the actual numerator (n) and denominator (d) from which they were derived. In text, the numerator and denominator should be expressed as “n of d” not by the virgule construction “...

## Reporting Rates and Ratios.

### in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year:
Feb 2020
Published Online:
Feb 2020
DOI:
10.1093/jama/9780190246556.003.0018.022.0019
Item type:
section
Use the virgule construction for rates when placed in parentheses (eg, 1/2) but never in running text. A colon is used for ratios (eg, 1:2). Rates should use the decimal format when the denominator is understood to be 100; otherwise, the denominator should be specified....

## Roman Numerals.

### in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year:
Feb 2020
Published Online:
Feb 2020
DOI:
10.1093/jama/9780190246556.003.0018.022.0020
Item type:
section
Use roman numerals with proper names (eg, Henry Ford III). Note that no comma is used before the numeral. However, arabic numerals should be used as designators in all other cases (eg, round 2, Table 4, year 5; see 10.4, Designators) unless roman numerals are part of formally established nomenclature (...

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