Find Least Common Multiple of 39, 65 and 78 using division method..
Answer
LCM( 39, 65, 78 ) = 390
Explanation
Step 1 : Write the given numbers in a horizontal line.
| 39 | 65 | 78 |
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 | 39 | 65 | 78 |
| 39 | 65 | 39 |
Step 3 : Continue dividing by prime numbers till we get 1 in all columns.
| 2 | 39 | 65 | 78 |
| 3 | 39 | 65 | 39 |
| 5 | 13 | 65 | 13 |
| 13 | 13 | 13 | 13 |
| 1 | 1 | 1 |
Step 4 : Multiply numbers in first column to get LCM.
LCM( 39, 65, 78 ) = 2 · 3 · 5 · 13 = 390 .
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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