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Answered By: Jeneen LaSee-Willemssen Last Updated: Mar 07, 2016 Views: 345
According to APA Style (6th edition), you should normally use numerals for the numbers 10 and above. You should use words to express numbers below 10 (one, two, three, four, five, six, seven, eight, and nine).
Note, however, that APA lists a wide variety of exceptions. For instance, numbers that appear right before a unit of measurement should be expressed as numerals, regardless of where they fall, before or after 10. Example: Give him 5 cups of soup.
Check out the APA Style blog for more examples: http://www.apastyle.org/learn/faqs/numbers-as-words.aspx
The sections in APA that address numbers are 4.31-4.38 of the Publication Manual.