The Lowest Common Multiple (LCM) of 2, 5, 7 and 9 is 630.
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The LCM (least common multiple) of 5, 7, and 9 is 315.
63
2, 3, 5 and 7
1 goes in 45 times. 3 goes in 15 times. 5 goes in 9 times. 9 goes in 5 times. The rest don't go in.
3 and 5, yes. 2, 9 and 10, no.