There is no 'greatest common multiple' of any two numbers. You can keep multiplying towards infinity and you will never reach a maximum.
You may either be thinking of...
...the least common multiple of 3 and 4, which is 12.
...the greatest common denominator of 3 and 4, which is 1.
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The greatest common multiple is an infinite amount and not very practical for problem solving.
The greatest common multiple of 8 and 20 is 4.
Oh, dude, the greatest common multiple of 4, 5, and 3 is just the largest number that all of them can divide evenly into. So, you just gotta look at their multiples and find the biggest one they all share. It's like a math puzzle, but not as fun as a jigsaw puzzle, you know?
A multiple of a number x is xy where y is any integer. For example, multiples of 3 include 12 (3x4) 15 (3x5) and 36 (3x12) A common multiple of x and z is any number that can be expressed as a multiple of x or z. For instance 36 is a common multiple of 3 and 4, as it is a multiple of both. The term "greatest" means the highest valued number. For instance, the greatest out of 4, 68 and 20 is 68. It makes no sense to speak of a "greatest common multiple" as common multiples will go up to infinity. If I have a common multiple m, then 2m, 3m, 4m and so on will also be common multiples.
The Greatest Common Factor (GCF) is: 4 .The greatest common multiple of any set of integers is infinite.