lcm of 20 and 9 — step-by-step solution

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

20

2^{2} \times 5

9

3^{2}

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

▶

ppcm (20, 9)

2^{2} \times 5 \times 3^{2}

180