Question
Find Least Common Multiple of 8, 12, 16, 24 and 36 using prime factorisation method.
Answer
LCM( 8, 12, 16, 24, 36 ) = 144
Explanation
Step 1: Write down factorisation of each number:
8 = 2 · 2 · 2
12 = 2 · 2 · 3
16 = 2 · 2 · 2 · 2
24 = 2 · 2 · 2 · 3
36 = 2 · 2 · 3 · 3
Step 2 : Match primes vertically:
| 8 | = | 2 | · | 2 | · | 2 | ||||||
| 12 | = | 2 | · | 2 | · | 3 | ||||||
| 16 | = | 2 | · | 2 | · | 2 | · | 2 | ||||
| 24 | = | 2 | · | 2 | · | 2 | · | 3 | ||||
| 36 | = | 2 | · | 2 | · | 3 | · | 3 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 8 | = | 2 | · | 2 | · | 2 | ||||||||
| 12 | = | 2 | · | 2 | · | 3 | ||||||||
| 16 | = | 2 | · | 2 | · | 2 | · | 2 | ||||||
| 24 | = | 2 | · | 2 | · | 2 | · | 3 | ||||||
| 36 | = | 2 | · | 2 | · | 3 | · | 3 | ||||||
| LCM | = | 2 | · | 2 | · | 2 | · | 2 | · | 3 | · | 3 | = | 144 |
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