lcm of 15 and 20 — step-by-step solution

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

15

3 \times 5

20

2^{2} \times 5

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

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ppcm (15, 20)

3 \times 5 \times 2^{2}

60