Find Least Common Multiple of 6, 2 and 15 using prime factorisation method.
Answer
LCM( 6, 2, 15 ) = 30
Explanation
Step 1: Write down factorisation of each number:
6 = 2 · 3
2 = 2
15 = 3 · 5
Step 2 : Match primes vertically:
| 6 | = | 2 | · | 3 | ||
| 2 | = | 2 | ||||
| 15 | = | 3 | · | 5 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 6 | = | 2 | · | 3 | ||||
| 2 | = | 2 | ||||||
| 15 | = | 3 | · | 5 | ||||
| LCM | = | 2 | · | 3 | · | 5 | = | 30 |
This solution can be visualized using a Venn diagram.
The LCM is equal to the product of all the numbers on the diagram.
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