LCM( 4, 4, 5, 12 ) = 60
Step 1: Write down factorisation of each number:
4 = 2 · 2
4 = 2 · 2
5 = 5
12 = 2 · 2 · 3
Step 2 : Match primes vertically:
4 | = | 2 | · | 2 | ||||
5 | = | 5 | ||||||
12 | = | 2 | · | 2 | · | 3 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
4 | = | 2 | · | 2 | ||||||
5 | = | 5 | ||||||||
12 | = | 2 | · | 2 | · | 3 | ||||
LCM | = | 2 | · | 2 | · | 3 | · | 5 | = | 60 |