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I would give the 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 barely sure that you could prove to yourself that you cannot do the piles the size they are, eight and nine, with such relatively small numbers. If there is any denomination more than five. 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 eighth bill that is 24, four or five, and four singles. And the other one, nine bill, is three, five, and six singles.