Find Least Common Multiple of 2, 9 and 18 using prime factorisation method.
Answer
LCM( 2, 9, 18 ) = 18
Explanation
Step 1: Write down factorisation of each number:
2 = 2
9 = 3 · 3
18 = 2 · 3 · 3
Step 2 : Match primes vertically:
| 2 | = | 2 | ||||
| 9 | = | 3 | · | 3 | ||
| 18 | = | 2 | · | 3 | · | 3 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 2 | = | 2 | ||||||
| 9 | = | 3 | · | 3 | ||||
| 18 | = | 2 | · | 3 | · | 3 | ||
| LCM | = | 2 | · | 3 | · | 3 | = | 18 |
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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