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Commutative Cooking

On his late night show, Jay Leno often shares odd items from newspapers. I almost woke up on hearing this one...

It was a want-ad: "I need to trade a 9 x 13 pan for a 13 x 9 pan. Desperate."

Ah, the power of a cook who also knows some mathematics. He or she would just rotate the pan...hopefully!

Note: You are welcome to use this ad as a test question to see if your students understand the commutative property of multiplication.

Source: Jay Leno Show, August 2, 2010