That would be 28 and 56.
Math:
4 - 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56
7 - 7, 14, 21, 28, 35, 42, 49, 56
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lcm(4, 9) = 36 → the two least common multiples (ie the first two common multiples) of 4 and 9 are 36 and 72.
They are 12 and 24
4, 8, 12, 16
The first five multiples of 4 are 4, 8, 12, 16 and 20. For them to be common, they need to be compared to another set of multiples.
The common multiples of any two or more numbers are the multiples of their lowest common multiple.lcm(3, 4, 5) = 60→ first three common multiples are:60 x 1 = 6060 x 2 = 12060 x 3 = 18060, 120, 180