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Question
Find the LCM:
4, 12, 20
Solution
| 2 | 4 |
| 2 | 2 |
| 1 |
| 2 | 12 |
| 2 | 6 |
| 3 | 3 |
| 1 |
| 2 | 20 |
| 2 | 10 |
| 5 | 5 |
| 1 |
4 = 2 × 2
12 = 2 × 2 × 3
20 = 2 × 2 × 5
∴ LCM = 2 × 2 × 3 × 5
= 60
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