LCM( 45, 55, 70 ) = 6930
Step 1 : Write the given numbers in a horizontal line.
45 | 55 | 70 |
Step 2 : Divide the given numbers by smallest prime number. In this example we can divide by 2.
(if any number is not divisible by 2, write it down unchanged)
2 | 45 | 55 | 70 |
45 | 55 | 35 |
Step 3 : Continue dividing by prime numbers till we get 1 in all columns.
2 | 45 | 55 | 70 |
3 | 45 | 55 | 35 |
3 | 15 | 55 | 35 |
5 | 5 | 55 | 35 |
7 | 1 | 11 | 7 |
11 | 1 | 11 | 1 |
1 | 1 | 1 |
Step 4 : Multiply numbers in first column to get LCM.
LCM( 45, 55, 70 ) = 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.