See 3.11, pp. 70-74 in the APA Publication Manual for rules about the hyphenation of words in APA style. Numbers Used in Body of Paper Generally, numbers one through nine in sentences should be spelled out. Numbers 10 and greater should be typed as numerals, except where they begin a sentence. Exceptions are described on pages 99-105.
Percent Use the symbol for percent only when it is preceded by a numeral.
Use the word percentage when a number is not given. Generally, one should choose nouns, pronouns, and adjectives to eliminate the possibility of ambiguity in sex identity. Moreover, scientific writing should be free of implied or irrelevant evaluation of the sexes. Students are usually the best judges of the quality of the courses they have taken. The mission of the Starship Enterprise is to go boldly where no one has gone before.