LCM( 7, 2, 8, 8 ) = 56
Step 1: Write down factorisation of each number:
7 = 7
2 = 2
8 = 2 · 2 · 2
8 = 2 · 2 · 2
Step 2 : Match primes vertically:
7 | = | 7 | ||||||
2 | = | 2 | ||||||
8 | = | 2 | · | 2 | · | 2 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
7 | = | 7 | ||||||||
2 | = | 2 | ||||||||
8 | = | 2 | · | 2 | · | 2 | ||||
LCM | = | 2 | · | 2 | · | 2 | · | 7 | = | 56 |