Using prime factorisation:
12 = 2² x 3
15 = 3 x 5
→hcf = 3
→lcm = 2² x 3 x 5 = 60
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12
Fifteen is the least common multiple of three and five. 3 * 5 = 15 5 * 3 = 15
The LCM of the first twelve counting numbers is 27720
The least common multiple of 14 and 27 is 378
The least common multiple of 6 and 34 is 102.