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I'm writing a formal legal memo and could not find any explicit form of writing a plural letter grade (as in the example below).

Timmy made one C. His other grades were all As and Bs. (A's and B's?)

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Found a somewhat reliable article (on grammarglitchcentral.com), which talks about The Chicago Manual of Style.

As per the article:

In paragraph 7.60 on page 367, the Manual states that academic grade letters are usually capitalized and not italicized. This paragraph also says, "No apostrophe is required in the plural." Here are some good examples:

  • My daughter had all As on her last report card.
  • There are only two Cs on Paul's entire high school transcript.
  • If I have one B and four As for this term, what is my grade point average?

PLEASE NOTE: According to the Manual (paragraph 7.14 on page 353), this rule does NOT apply to lower case letters used like words in text. An apostrophe is used to form the plural of these so references like a's will not be confused with the word as or i's with the word is. Here are some examples:

  • Writers should mind their grammar p's and q's.
  • Algebra is full of x's and y's.
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    So, if you ever write for Chicago University Press, that's what you should do. Everybody else does whatever they like. Apostrophe's are silent, after all. Commented Oct 3, 2014 at 20:44

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