Find Least Common Multiple of 2, 4, 6 and 12 using prime factorisation method.
Answer
LCM( 2, 4, 6, 12 ) = 12
Explanation
Step 1: Write down factorisation of each number:
2 = 2
4 = 2 · 2
6 = 2 · 3
12 = 2 · 2 · 3
Step 2 : Match primes vertically:
| 2 | = | 2 | ||||
| 4 | = | 2 | · | 2 | ||
| 6 | = | 2 | · | 3 | ||
| 12 | = | 2 | · | 2 | · | 3 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 2 | = | 2 | ||||||
| 4 | = | 2 | · | 2 | ||||
| 6 | = | 2 | · | 3 | ||||
| 12 | = | 2 | · | 2 | · | 3 | ||
| LCM | = | 2 | · | 2 | · | 3 | = | 12 |
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