Writing tip 25: I’m at 6s and 7s: Do I use an apostrophe?
No, don’t use an apostrophe when you are writing numbers or letters in the plural.
Examples
I’m at 6s and 7s (or sixes and sevens).
The 1990s seemed to pass in a flash.
Kate got two As and four Bs that year at university.
However, use an apostrophe when there could be confusion.
Examples
Dot the i's and cross the t's.
Mind your p's and q's.
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