Multiply each of these numbers by different integers, to get their multiples. For example, the multiples of 4 are:4 x 0 = 0
4 x 1 = 4
4 x 2 = 8
etc.
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The common multiples of an set of numbers are the multiples of their lowest common multiple. lcm(7, 8, 9) = 504 → the first 3 common multiples of 7, 8, 9 are 504, 1008, 1512.
Multiples of 840
Since 8 is a multiple of 2 and 4, all multiples of 8 are also multiples of both of them. Thus, Jose and maria are both correct.
504 is the least common multiple of 7, 8 and 9. All numbers that are multiples of 504 are multiples of 7, 8 and 9 as well
Neither, some multiples of 8 are: 8,16,24,32,40,48,56,64