22, 44, 66.
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The firt three multiples of 8 are 8, 16 and 24.
To find the common multiples of 12 and 11, we need to list out the multiples of each number and find where they intersect. The first three common multiples of 12 and 11 are 132, 264, and 396. This is because the multiples of 12 are 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, and so on, and the multiples of 11 are 11, 22, 33, 44, 55, 66, 77, 88, 99, 110, 121, 132, 143, and so on.
A common multiple of 8 and 6 has the form 2 * 2 * 2 * 3 * n = 24n, where n is any whole number. The other factors are necessary to ensure that what you have is indeed a multiple of both 8 (2 * 2 * 2) and 8 (2 * 3). So for the first 3 common multiples you need to replace n with 1, 2 and 3, giving you 24, 48 and 72.
The first 3 multiples of 13 are: 13, 26, and 39.
2, 3 and 5 go into multiples of 30.