The least common factor of any set of integers is 1.
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The least common factor of 56 and 60 is 1. The greatest common factor of 56 and 60 is 4.
The least common multiple of two numbers is the product of the two numbers divided by their greatest common factor. The greatest common factor of 4 and 8 is 8. (See related question "What is the greatest common factor of 4 and 8?" for this calculation.) So, the least common multiple is 4 x 8 ÷ 4 = 8. Common multiples of 4 and 8 include 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, etc. Although 16 is a common multiple, it is not the least common multiple.
Oh, dude, like, the highest common factor of 48, 56, and 80 is 8. It's like the biggest number that can divide evenly into all three of those numbers without leaving a remainder. So, yeah, 8 is the winner here.
8 is a factor of 56 because 7 times 8 equals 56
28 is a factor of 56, and 28 is also a factor of itself. So the highest common factor of 28 and 56 is 28.