Question
Find Least Common Multiple of 22, 32 and 60 using prime factorisation method.
Answer
LCM( 22, 32, 60 ) = 5280
Explanation
Step 1: Write down factorisation of each number:
22 = 2 · 11
32 = 2 · 2 · 2 · 2 · 2
60 = 2 · 2 · 3 · 5
Step 2 : Match primes vertically:
| 22 | = | 2 | · | 11 | ||||||||||||
| 32 | = | 2 | · | 2 | · | 2 | · | 2 | · | 2 | ||||||
| 60 | = | 2 | · | 2 | · | 3 | · | 5 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 22 | = | 2 | · | 11 | ||||||||||||||
| 32 | = | 2 | · | 2 | · | 2 | · | 2 | · | 2 | ||||||||
| 60 | = | 2 | · | 2 | · | 3 | · | 5 | ||||||||||
| LCM | = | 2 | · | 2 | · | 2 | · | 2 | · | 2 | · | 3 | · | 5 | · | 11 | = | 5280 |
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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