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“Mind your p’s and q’s!” This statement usually refers to reminding a person to watch their manners. While the definition is easy to understand, the origin of this saying is not clear. Some people think that it comes from a similar reminder for people to remember their “please and thank-yous” where the “q’s” rhymes with “yous.” Others believe that it was a reminder to young children not to mix up p’s and q’s when writing because both letters look very similar.

However, maybe the origin of this saying comes from math. When working with theorems (as you did in the last lesson), mathematicians encounter if-then statements. Often, if-then statements are defined as “if p, then q,” with the p

representing an assumption and the q representing the outcome of the assumption. So, just maybe math played a role in this saying.

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