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Anonymous
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23/27 ÷ 45 = 23/27 ÷ 45/1 = 23/27 × 1/45 = (23×1)/(27×45) = 23/1215
28/5 x 7/9 = 196/45 = 4 and 16/45
1, 3, 5, 9, 15, 27, 45, 81, 135, 405
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