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Question
Find the prime factorisation number by factor tree method and division method.
420
Solution
420
∴ 420 = 2 × 2 × 3 × 5 × 7
Also
| 2 | 420 |
| 2 | 210 |
| 3 | 105 |
| 5 | 35 |
| 7 | 7 |
| 1 |
420 = 2 × 210
= 2 × 2 × 105
= 2 × 2 × 3 × 35
= 2 × 2 × 3 × 5 × 7
∴ 420 = 2 × 2 × 3 × 5 × 7
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