lcm of 7 and 20 — step-by-step solution

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

7

7

20

2^{2} \times 5

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

▶

ppcm (7, 20)

7 \times 2^{2} \times 5

140