Question
Find Least Common Multiple of 91, 65 and 56 using division method..
Answer
LCM( 91, 65, 56 ) = 3640
Explanation
Step 1 : Write the given numbers in a horizontal line.
| 91 | 65 | 56 |
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 | 91 | 65 | 56 |
| 91 | 65 | 28 |
Step 3 : Continue dividing by prime numbers till we get 1 in all columns.
| 2 | 91 | 65 | 56 |
| 2 | 91 | 65 | 28 |
| 2 | 91 | 65 | 14 |
| 5 | 91 | 65 | 7 |
| 7 | 91 | 13 | 7 |
| 13 | 13 | 13 | 1 |
| 1 | 1 | 1 |
Step 4 : Multiply numbers in first column to get LCM.
LCM( 91, 65, 56 ) = 2 · 2 · 2 · 5 · 7 · 13 = 3640 .
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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