The LCM (least common multiple) of 5, 7, and 9 is 315.
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The Lowest Common Multiple (LCM) of 2, 5, 7 and 9 is 630.
630 = 7 x 90 = 9 x 70 = 5 x 126 = 6 x 105
1890
3/5 x 7/9 is 7/15
No, but these numbers can: 1, 3, 5, 9, 15, 27, 45, 135.