Not sure this question is stated correctly.
Answering logically, the LCM of 12 (3x4) and 24 (12x2) is 24. This is because 12(x2=24) and 24(x1=24) are both factors of 24.
Altering the question slightly, the least common multiple of 2, 3, 4, and 12 is 12. This is because 2(x6=12), 3(x4=12), 4(x3=12), and 12(x1=12) are all factors of 12.
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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.
3x4=12-4=8
yes 2x4=8 4x2=8 or 2x6=12 3x4=12 No, but any multiple of 2 is a multiple of 4. For example, 26 is a multiple of 2 (x13) but NOT a multiple of 4 (4x6=24; 4x7=28).
12
no its 12