Theodore has 20 baseball cards. He sells 1/4 of his cards to Tom, 1/3 of his cards to Larry, and his Mom accidentally throws away 1/6 of his cards. How many baseball cards does Theodore have left?

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Convert the different denominators to a common denominator that all the denominators can divide into evenly. 4, 3, and 6 all divide evenly into 12. TC.nvert 1/4 tox/12, divide 12 (the new common denominator) by 4 (the old common denominator) to get 3. Then multiply 1/4 by 3/3 (another way of saying 1). The product is 3/12. (1/4 = 3/12)

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