Find Least Common Multiple of 3300, 120 and 120 using prime factorisation method.
Answer
LCM( 3300, 120, 120 ) = 6600
Explanation
Step 1: Write down factorisation of each number:
3300 = 2 · 2 · 3 · 5 · 5 · 11
120 = 2 · 2 · 2 · 3 · 5
120 = 2 · 2 · 2 · 3 · 5
Step 2 : Match primes vertically:
| 3300 | = | 2 | · | 2 | · | 3 | · | 5 | · | 5 | · | 11 | ||
| 120 | = | 2 | · | 2 | · | 2 | · | 3 | · | 5 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 3300 | = | 2 | · | 2 | · | 3 | · | 5 | · | 5 | · | 11 | ||||
| 120 | = | 2 | · | 2 | · | 2 | · | 3 | · | 5 | ||||||
| LCM | = | 2 | · | 2 | · | 2 | · | 3 | · | 5 | · | 5 | · | 11 | = | 6600 |
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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