The first common multiple is 18. (9*2=18, 6*3=18)
(9*3=27, 27/6 is a fraction)
The second common multiple is 36. (9*4=36, 6*6=36)
(9*5=45, 45/6 is a fraction)
The third common multiple is 54. (9*6=54, 6*9=54)
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24, 48, 72.
24 and 48
First three common multiples of 5 and 6 are 30, 60 and 90.
The first three common multiples of 6 and 8 are the first three multiples of the least common multiple of 6 and 8. 6 = 2 x 3 and 8 = 2 x 2 x 2. Therefore, the LCM of 6 and 8 is 2 x 2 x 2 x 3 or 24. The first three multiples of 24 are 24, 48 and 72.
The smallest three common mulltiples of 6 and 24 are 24, 48, and 72.