Yes
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The greatest common multiple of two numbers is the smallest number that is a multiple of both numbers. In this case, the multiples of 7 are 7, 14, 21, 28, 35, 42, 49, 56, and so on. The multiples of 56 are 56, 112, 168, 224, and so on. The smallest number that appears in both lists is 56, so the greatest common multiple of 7 and 56 is 56.
No, 112 is a multiple of 56.
The least common multiple of 56 , 112 , 128 = 896