I'm copying the relevant info from the APA style guide because it's phrased most simply. I'll include the bits about numbers in general, because you'll need this somewhere, sometime, and also you'll have to put a number before the percent sign, right?
Spell out common numbers under 10. Use figures to express numbers 10 and above and words to express numbers below 10. Ex: She had a set of eight glasses until I got drunk and dropped one on the patio.
Ex: Why is a baker's dozen 13, anyway? Spell out common fractions, common expressions, and centuries (one-half, Fourth of July, twentieth century).To make plurals out of numbers, add s only, with no apostrophe (the 1950s).When numbers below 10 must be mixed with numbers above 10 in the same sentence they should be written as numerals. For example, write "the students trying out for the soccer team included 5 girls and 16 boys." Use words and numerals with two numbers in series (five 4-point scales).Use combinations of numerals and written numbers for large approximate sums (over 3 million people). And finally, the answer you really wanted: Use the percent symbol (%) only with figures (5%) not with written numbers (five percent).
So if you put these rules together, there are cases where you spell the number out and write "percent" (if the percent is less than 10 and with no numbers larger than 10 in the same sentence)... Ex: "Would you hand me the carton of two percent milk?" ... or if the percentage comes at the beginning of the sentence, always spell it out..
Ex.: "Fifty-nine percent of the people in my class are girls. Since I'm a guy, I'm happy with this."
...or if there are two percentages one less than 10 and one 10 or more, use numerals and the percent symbol for both... Ex: "The chances of the coin toss coming up in my favor is 50%, but drawing an ace from a deck of cards is about 7.7%"
I'm copying the relevant info from the APA style guide because it's phrased most simply. I'll include the bits about numbers in general, because you'll need this somewhere, sometime, and also you'll have to put a number before the percent sign, right? Spell out common numbers under 10. Use figures to express numbers 10 and above and words to express numbers below 10. Ex: She had a set of eight glasses until I got drunk and dropped one on the patio. Ex: Why is a baker's dozen 13, anyway? Spell out common fractions, common expressions, and centuries (one-half, Fourth of July, twentieth century).To make plurals out of numbers, add s only, with no apostrophe (the 1950s).When numbers below 10 must be mixed with numbers above 10 in the same sentence they should be written as numerals. For example, write "the students trying out for the soccer team included 5 girls and 16 boys." Use words and numerals with two numbers in series (five 4-point scales).Use combinations of numerals and written numbers for large approximate sums (over 3 million people). And finally, the answer you really wanted: Use the percent symbol (%) only with figures (5%) not with written numbers (five percent). So if you put these rules together, there are cases where you spell the number out and write "percent" (if the percent is less than 10 and with no numbers larger than 10 in the same sentence)... Ex: "Would you hand me the carton of two percent milk?" ... or if the percentage comes at the beginning of the sentence, always spell it out.. Ex.: "Fifty-nine percent of the people in my class are girls. Since I'm a guy, I'm happy with this." ...or if there are two percentages one less than 10 and one 10 or more, use numerals and the percent symbol for both... Ex: "The chances of the coin toss coming up in my favor is 50%, but drawing an ace from a deck of cards is about 7.7%"
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