Question

What is lcm of 20, 25, 30​

Answer 1

300

Explanation:

20 = 2² × 5

25 = 5²

30 = 2 × 3 × 5

For the LCM, you need common and not common factors with higher exponent.

Out of 2² and 2, chose 2².

Out of 3 chose 3.

Out of 5 and 5² choose 5².

LCM = 2² × 3 × 5² = 300

Answer: 300

Answer 2

The least common multiple of 20, 25 and 30 is 300.