"The" five multiples is wrong; each integer has infinitely many multiples, not just five. To get multiples, in this case, please calculate:
30 x 1
30 x 2
etc.
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There are 3 such numbers: 30, 60, 90.
The first five common multiples are the first five multiples of the lowest common multiple. lcm(5, 6): 5 = 5 6 = 2 x 3 → lcm = 2 x 3 x 5 = 30 → first 5 common multiples of 5 and 6 are: 30 x 1 = 30 30 x 2 = 60 30 x 3 = 90 30 x 4 = 120 30 x 5 = 150
15, 30, 45, 60, 75
well five times two is ten so double five and you have the same multiples
Since the lowest common multiple of 3 and 5 is 15, the common multiples of 3 and 5 are the multiples of 15: 30, 45, 60, 75, 90, etc...