I was helping Xavier with fractions yesterday. He had to determine the least common denominator for 5/6 and 2/7.
Me: Correct. And 5/6 is how many forty-twoths?
X: You said that wrong.
Me: I did?
X: Yeah, you said 'forty-twoths.'
Me: Oh, I'm sorry--"forty-teeth."
LOL He's so disappointed in me, but I just couldn't help myself.