The essential rules for using the numeric expression of numbers in your writing are that you should use numerals when:
The essential rules for using the verbal expression of numbers in your writing are that you should use words when:
APA recommends the use of the metric system when referring to physical measurement units for the greatest global comprehensibility of your writing. There are a few written style guidelines for how to use the metric system in your writing including: abbreviation, capitalization, pluralization, and spacing:
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APA recommends that whenever a writer needs to refer to statistics or mathematical copy (e.g., equations, symbols, etc.), they should use the format that makes it the easiest for the reader to understand the data. Here are the basic guidelines for this principle:
APA recommends the following rules for when a writer need to refer to statistics in writing:
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APA recommends the following rules for when a writer need to refer to mathematical equations in writing:
If you need more assistance with APA number rules, see sections 4.31 (pp. 111-112), 4.32 (p. 112), 4.40 (p. 115), 4.41-45 (pp. 116-118), and 4.46-49 (p. 118-124) in the APA Manual 6th edition.
For more rules of number usage in APA writing, check out the following APA style blogs:
