Find Least Common Multiple of 45, 55 and 70 using prime factorisation method.
Answer
LCM( 45, 55, 70 ) = 6930
Explanation
Step 1: Write down factorisation of each number:
45 = 3 · 3 · 5
55 = 5 · 11
70 = 2 · 5 · 7
Step 2 : Match primes vertically:
| 45 | = | 3 | · | 3 | · | 5 | ||||||
| 55 | = | 5 | · | 11 | ||||||||
| 70 | = | 2 | · | 5 | · | 7 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 45 | = | 3 | · | 3 | · | 5 | ||||||||
| 55 | = | 5 | · | 11 | ||||||||||
| 70 | = | 2 | · | 5 | · | 7 | ||||||||
| LCM | = | 2 | · | 3 | · | 3 | · | 5 | · | 7 | · | 11 | = | 6930 |
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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