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The Cuisenaire Rods model illustrates why the algorithms for adding and subtracting fractions work -- namely, that you cannot add the fractions until they are expressed in the same units. It also shows why the alternative algorithm for dividing fractions (finding a common denominator and then dividing the numerators) works. It does not, however, illustrate why the multiplication algorithm (multiplying the numerators and multiplying the denominators) works.
<< back to Part B: Fractions With Cuisenaire Rods
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