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Question
Find the LCM:
15, 30, 90
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Solution
| 3 | 15 |
| 5 | 5 |
| 1 |
| 2 | 30 |
| 3 | 15 |
| 5 | 5 |
| 1 |
| 2 | 90 |
| 3 | 45 |
| 3 | 15 |
| 5 | 5 |
| 1 |
15 = 3 × 5
30 = 2 × 3 × 5
90 = 2 × 3 × 3 × 5
∴ LCM = 5 × 3 × 2 × 3
= 90
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