210.
30 = 2 x 3 x 5
21 = 3 x 7
lcm = 2 x 3 x 5 x 7 = 210
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The LCM (lowest common multiple) for 15 and 21 is 105. 15; 15, 30, 45, 60, 75, 90, 105, 120 21; 21, 42, 63, 84, 105, 126
The LCM of 21 and 18 is 126.
The LCM is 30.
The LCM is 105.
The LCM is 210.