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It is: 420
You need at least two numbers to find an LCM.
28 14,2 7,2,2
22 x 7 = 28
256 = 28
256 = 28.
28 = 256
2 x 2 x 7 = 28 5 x 7 = 35 2 x 2 x 5 x 7 = 140, the LCM
No. The prime factorization of 28 is 2x2x7.
22 x 71
It is: 4