List the multiples of each number
Find the smallest multiple they have in common
Use prime factorization and take the highest power of each prime
Multiply those highest powers together
Use the formula LCM(a, b) = |a × b| ÷ GCD(a, b)
For more than two numbers, find the LCM of two numbers first, then use that result with the next number
Check your answer by confirming it is divisible by each original number