Find Least Common Multiple of 55, 70 and 77 using prime factorisation method.
Answer
LCM( 55, 70, 77 ) = 770
Explanation
Step 1: Write down factorisation of each number:
55 = 5 · 11
70 = 2 · 5 · 7
77 = 7 · 11
Step 2 : Match primes vertically:
| 55 | = | 5 | · | 11 | ||||
| 70 | = | 2 | · | 5 | · | 7 | ||
| 77 | = | 7 | · | 11 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 55 | = | 5 | · | 11 | ||||||
| 70 | = | 2 | · | 5 | · | 7 | ||||
| 77 | = | 7 | · | 11 | ||||||
| LCM | = | 2 | · | 5 | · | 7 | · | 11 | = | 770 |
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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