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## Expressing Quantities

*Phil B. Fontanarosa and Stacy Christiansen*

### in AMA Manual of Style: A Guide for Authors and Editors (10th edition)

Arabic numerals are used for quantities with units of measure (see , Numbers and Percentages, Use of Numerals). By SI convention, it is preferable to use only numbers between 0.1 and 1000 and to use ...
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## Multiplication of Numbers

*Phil B. Fontanarosa and Stacy Christiansen*

### in AMA Manual of Style: A Guide for Authors and Editors (10th edition)

Multiplication of numbers should be indicated by the multiplication sign (×) and may be used to express area (eg, a 15 × 35-cm2 burn), volume (eg, a 5.2 × 3.7 × 6.9-m3 cube), matrixes (eg, 2 × 2 ...
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## Decimal Format

*Phil B. Fontanarosa and Stacy Christiansen*

### in AMA Manual of Style: A Guide for Authors and Editors (10th edition)

The decimal format is recommended for numbers used with units of measure. Numerical values less than 1 require placement of 0 before the decimal marker. However, certain statistical values, such as α ...
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## Number Spacing

*Phil B. Fontanarosa and Stacy Christiansen*

### in AMA Manual of Style: A Guide for Authors and Editors (10th edition)

By SI convention, the decimal point is the only punctuation mark permitted in numerals, and it is used to separate the integer and decimal parts of the number. The SI does not use commas in numbers, ...
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## Indexes

*Phil B. Fontanarosa and Stacy Christiansen*

### in AMA Manual of Style: A Guide for Authors and Editors (10th edition)

An index generally refers to a quantity derived from a ratio of 2 (or more) measurable quantities and often is used to compare individuals with each other or with normal values. Except for products ...
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