What is the LCM of 20 and 30?
The LCM of 20 and 30 is 60.
Steps to find LCM
- Find the prime factorization of 20
20 = 2 × 2 × 5 - Find the prime factorization of 30
30 = 2 × 3 × 5 - Multiply each factor the greater number of times it occurs in steps i) or ii) above to find the LCM:
LCM = 2 × 2 × 3 × 5 - LCM = 60
MathStep (Works offline)
Download our mobile app and learn how to find LCM of upto four numbers in your own time:
Android and iPhone/ iPad
Find least common multiple (LCM) of: 40 & 60 10 & 15 60 & 90 100 & 150 4 & 6 140 & 210 40 & 30 20 & 60 60 & 30 20 & 90 100 & 30 20 & 150 140 & 30 20 & 210
LCM Calculator
Enter two numbers separate by comma. To find least common multiple (LCM) of more than two numbers, click here.