Question
Find Least Common Multiple of 24, 82 and 50 using prime factorisation method.
Answer
LCM( 24, 82, 50 ) = 24600
Explanation
Step 1: Write down factorisation of each number:
24 = 2 · 2 · 2 · 3
82 = 2 · 41
50 = 2 · 5 · 5
Step 2 : Match primes vertically:
| 24 | = | 2 | · | 2 | · | 2 | · | 3 | ||||||
| 82 | = | 2 | · | 41 | ||||||||||
| 50 | = | 2 | · | 5 | · | 5 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 24 | = | 2 | · | 2 | · | 2 | · | 3 | ||||||||
| 82 | = | 2 | · | 41 | ||||||||||||
| 50 | = | 2 | · | 5 | · | 5 | ||||||||||
| LCM | = | 2 | · | 2 | · | 2 | · | 3 | · | 5 | · | 5 | · | 41 | = | 24600 |
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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