Question
Find Least Common Multiple of 36, 12, 3, 6, 2 and 3 using prime factorisation method.
Answer
LCM( 36, 12, 3, 6, 2, 3 ) = 36
Explanation
Step 1: Write down factorisation of each number:
36 = 2 · 2 · 3 · 3
12 = 2 · 2 · 3
3 = 3
6 = 2 · 3
2 = 2
3 = 3
Step 2 : Match primes vertically:
| 36 | = | 2 | · | 2 | · | 3 | · | 3 |
| 12 | = | 2 | · | 2 | · | 3 | ||
| 3 | = | 3 | ||||||
| 6 | = | 2 | · | 3 | ||||
| 2 | = | 2 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 36 | = | 2 | · | 2 | · | 3 | · | 3 | ||
| 12 | = | 2 | · | 2 | · | 3 | ||||
| 3 | = | 3 | ||||||||
| 6 | = | 2 | · | 3 | ||||||
| 2 | = | 2 | ||||||||
| LCM | = | 2 | · | 2 | · | 3 | · | 3 | = | 36 |
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