Find Least Common Multiple of 2160 and 10584 using prime factorisation method.
Answer
LCM( 2160, 10584 ) = 105840
Explanation
Step 1: Write down factorisation of each number:
2160 = 2 · 2 · 2 · 2 · 3 · 3 · 3 · 5
10584 = 2 · 2 · 2 · 3 · 3 · 3 · 7 · 7
Step 2 : Match primes vertically:
| 2160 | = | 2 | · | 2 | · | 2 | · | 2 | · | 3 | · | 3 | · | 3 | · | 5 | ||||
| 10584 | = | 2 | · | 2 | · | 2 | · | 3 | · | 3 | · | 3 | · | 7 | · | 7 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 2160 | = | 2 | · | 2 | · | 2 | · | 2 | · | 3 | · | 3 | · | 3 | · | 5 | ||||||
| 10584 | = | 2 | · | 2 | · | 2 | · | 3 | · | 3 | · | 3 | · | 7 | · | 7 | ||||||
| LCM | = | 2 | · | 2 | · | 2 | · | 2 | · | 3 | · | 3 | · | 3 | · | 5 | · | 7 | · | 7 | = | 105840 |
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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