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21=1x3x7
75=1x3x5x5
LCM=1x3x5x5x7=525
The LCM is: 105
The LCM is: 42
It is 231
3
It is 42
It is: 210
The LCM of 21 & 30 is... 210
252
21 = 3*7 56 = 23*7 LCM = 23 * 3 * 7 = 168
LCM(21, 14) = 42.