lcm of 15 and 12 — step-by-step solution

To calculate the LCM (least common multiple), we first decompose the numbers into prime factors.

15

3 \times 5

12

2^{2} \times 3

We keep every prime factor that appears, with its greatest exponent.

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ppcm (15, 12)

3 \times 5 \times 2^{2}

60