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division, it makes sense that building up should be done by multiplication. 4 2 2 2 1 2 2 1 15 9 5 3 3 3 5 3 54 48 9 6 8 6 9 8 A fraction can be built up to an equivalent form by multiplying by any form of one, any number over itself. 18 12 3 6 2 6 3 2 12 8 3 4 2 4 3 2 33 22 3 11 2 3 2 11 15 10 3 5
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