Do a prime factorization of both...
28 = 2x2x7
60 = 2x2x3x5
Use the common factor only once and the other factors
(2x2) is common to both ... use this only once
( 2x2)x7x3x5 = 420
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The least common multiple of 28 and 76 is 532
It is: 280
The least common multiple of 72120 , 28 = 504,840
Least Common Multiple (LCM) for 28 23 is 644
The least common multiple of the numbers 28 and 17 is 476.