There is no such thing as a Highest Common Multiple (HCM), for it always equals to infinity, since multiples always stretch forever.
For example, the HCM of 4 and 7.
Multiples of 4: 4, 8, 12, 16, 20, 24, 28, ... infinity
Multiples of 7: 7, 14, 21, 28, 35, 42, 49, ...infinity
According to the working, the highest common factor of any number will always be infinity.
Very little in a practical sense. The highest common multiple of any set of numbers is an infinite amount.
The highest common multiple is an infinite number and has very little practical use.
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There is no highest common multiple of 56, 98 and 168. Their highest common factor, which you may have meant, is 14.
I suppose you could say that the highest common multiple is infinity since there are an infinite number of common multiples. If you give a specific number as the highest common multiple, you can always find a larger one.
Infinity but the lowest common multiple is 25
The highest common multiple of two numbers is their least common multiple (LCM). The LCM of 3 and 5 is found by multiplying the two numbers and dividing by their greatest common divisor (GCD). In this case, the LCM of 3 and 5 is 15, as 3 * 5 / 1 = 15.
The highest common multiple of any set of integers is infinite.