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I would give to fifth graders because it's simple. The numbers are small, and they have the skill to deal with it. I did not specifically state denominations, but I'm fairly sure that you could prove to yourself that you cannot do the piles the size they are 8 and 9 with such relatively small numbers. If there is any denomination more than 5. Now, one interesting challenge is to prove that point. And I sort of sat in place with that a while. The answer, however, is that it's the 8th bills that are 24, 4, 5, and 4 singles. And the other one, 9 bill, is 3, 5, and 6 singles.