Find Least Common Multiple of 7, 13 and 36 using prime factorisation method.
Answer
LCM( 7, 13, 36 ) = 3276
Explanation
Step 1: Write down factorisation of each number:
7 = 7
13 = 13
36 = 2 · 2 · 3 · 3
Step 2 : Match primes vertically:
| 7 | = | 7 | ||||||||||
| 13 | = | 13 | ||||||||||
| 36 | = | 2 | · | 2 | · | 3 | · | 3 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 7 | = | 7 | ||||||||||||
| 13 | = | 13 | ||||||||||||
| 36 | = | 2 | · | 2 | · | 3 | · | 3 | ||||||
| LCM | = | 2 | · | 2 | · | 3 | · | 3 | · | 7 | · | 13 | = | 3276 |
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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