Another Random Grammatical Pet Peeve

When people say 'minused' instead of subtracted.

I don't know if it's necessarily wrong.

It just irritates me.

Jessie! No! Those Pills are Dangerous!

So, I have an unnamed friend who is a high school math teacher.  This past week, said teacher was working a problem with her students from her text book.  In the problem, there were two plants and a sprinkler - the object of the problem was to figure out where to place the sprinkler between the plants in order to make sure they both get the same amount of water. 

The name of the problem was "Equally Wet".

The problem appeared on, you guessed it, page 69.

I gotta give props to whoever edited this textbook.  He or she really had a strong appreciation for how the minds of high school students work.