First (Lowest) common multiple of 3 and 8:
24
3 * 24 = 72
The answer is 72.
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Least Common Multiple (LCM) for3 12is12
12
Use the methods you probably already learned, to find the least common multiple of 2 and 3. Then multiply this least common multiple by 1, by 2, by 3, etc., to get additional multiples.
Use one of the usual methods to get the least common multiple. To get additional multiples, multiply this least common multiple by 0, by 1, by 2, by 3, etc.
So the least common multiple means what they both multiply to get the same value. Unfortunately 48 doesn't go into 18, so we multiply that by 2. 96 still doesn't go into 18, so we multiple "48" by 3, 144 does go into 18. So 144 is your least common multiple.