30 = 5 X 3 X 2
42 = 7 X 3 X 2
Lowest common multiple is 7 X 5 X 3 X 2 = 210
Other common multiples are 420, 630, 840, 1050. 1260, 1470, 1680, 1890.
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The Least Common Multiple of 42, 48: 336
The least common multiples of 7 and 14 are 14,28 and 42>
The multiples of 3 up to 30 are: 3,6,9,12,15,18,21,24,27,30.The multiples of 5 up to 30 are: 5,10,15,20,25,30.The only common multiples are 15 and 30.The LCM is: 30
The common multiples of 5 and 6 are the multiples of their lowest common multiple (which is 30), so there are infinitely many common multiples of 5 and 6. The first five are: 30, 60, 90, 120, 150.
15 and 30