Rice Krispy Treats Math

by Jimmie Lanley on April 1, 2009

When we were recently in another city with Western foods, I bought some marshmallows and Rice Krispy cereal to bring home. So you know where this is going, don’t you? Sure! We made Krispy treats. (I think it was Sprite’s first time ever!)

So after we let them set in the refrigerator for a while, we cut them up to enjoy our “hard work.” Trying to emphasize math as much as possible, I asked Sprite how many pieces we’d have since I was cutting the four rows into four pieces. She answered correctly, and we each ate one. Yum.

Then I realized our dilemma anddecided to use it to my advantage to have some math fun!There were 14 left, and we’re a family of three.   So I asked Sprite how we should divide them evenly. She proposed some solutions, but none of them worked to divide 14 Rice Krispy bars evenly three ways.

I gave her a hint, “What if we ate some more? How many would we need to eat to have a number that’s easy to divide by three?”

I could see by the glint in her eye that she understood my devious plan. We each ate one more rice krispy treat.

Then the next day we divulged to my husband what we’d done, all in the name of fairness. I mean, this was the only way we could each have the same number — four each.

Funny, he didn’t see it that way.

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