Question
Find Least Common Multiple of 58, 92 and 120 using prime factorisation method.
Answer
LCM( 58, 92, 120 ) = 80040
Explanation
Step 1: Write down factorisation of each number:
58 = 2 · 29
92 = 2 · 2 · 23
120 = 2 · 2 · 2 · 3 · 5
Step 2 : Match primes vertically:
| 58 | = | 2 | · | 29 | ||||||||||
| 92 | = | 2 | · | 2 | · | 23 | ||||||||
| 120 | = | 2 | · | 2 | · | 2 | · | 3 | · | 5 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 58 | = | 2 | · | 29 | ||||||||||||
| 92 | = | 2 | · | 2 | · | 23 | ||||||||||
| 120 | = | 2 | · | 2 | · | 2 | · | 3 | · | 5 | ||||||
| LCM | = | 2 | · | 2 | · | 2 | · | 3 | · | 5 | · | 23 | · | 29 | = | 80040 |
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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