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Adding and subtracting mixed numbers

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Uploaded on Nov 11, 2011

First, I show two examples with visual models of adding or subtracting mixed numbers. Then we go on to abstract problems, in which we first need to rewrite each problem so that the fractions have a common denominator, and then we can add/subtract. In subtraction, borrowing may be necessary. I also solve one word problem involving a picture frame.

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