LCM( 70, 55 ) = 770
Step 1: Write down factorisation of each number:
70 = 2 · 5 · 7
55 = 5 · 11
Step 2 : Match primes vertically:
70 | = | 2 | · | 5 | · | 7 | ||
55 | = | 5 | · | 11 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
70 | = | 2 | · | 5 | · | 7 | ||||
55 | = | 5 | · | 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.