LCM of 42 and 105 is 210.
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The LCM is 210.
The LCM is: 420
The LCM is 630 as, 105 x6 =630 63 x 10=630 42x15 = 630
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 is 105.