Question
Find Least Common Multiple of 30, 60 and 80 using division method..
Answer
LCM( 30, 60, 80 ) = 240
Explanation
Step 1 : Write the given numbers in a horizontal line.
| 30 | 60 | 80 |
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 | 30 | 60 | 80 |
| 15 | 30 | 40 |
Step 3 : Continue dividing by prime numbers till we get 1 in all columns.
| 2 | 30 | 60 | 80 |
| 2 | 15 | 30 | 40 |
| 2 | 15 | 15 | 20 |
| 2 | 15 | 15 | 10 |
| 3 | 15 | 15 | 5 |
| 5 | 5 | 5 | 5 |
| 1 | 1 | 1 |
Step 4 : Multiply numbers in first column to get LCM.
LCM( 30, 60, 80 ) = 2 · 2 · 2 · 2 · 3 · 5 = 240 .
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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