you would have to make a factor tree for 8, 14, and 21. 8 equals 2*2*2. 14 equals 7*2 and 21 equals 7*3. Then you have to see what is the lowest number that they have in common. 8,14,21 do not have a number in commone so there isn't a common multiple.
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The Least Common Multiple (LCM) for 28 14 21 is 84.
The least common multiple of the numbers 14, 35 and 21 is 210.
42
210
210