I work out, I promise

I was giving my math lesson and we were trying to think of things that come in groups ie: tricycle (3's), months of the year (12), days of the week (7), etc. and the comedian of the class (not trying to be a comedian) said, "Ten pack, like when a person works out." I couldn't remember that it was actually called a 6 pack so I started to write down 10 pack, knowing it was wrong and then stopped in mid-writing. "It's called a 6 pack, not a 10 pack." There was laughter, no crap, and lots of it. I was having a great morning with these 7 and 8 year olds. I quickly corrected him (and me) and wrote 6 pack on the board.