Question
Find Least Common Multiple of 55, 185 and 200 using division method..
Answer
LCM( 55, 185, 200 ) = 81400
Explanation
Step 1 : Write the given numbers in a horizontal line.
| 55 | 185 | 200 |
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 | 55 | 185 | 200 |
| 55 | 185 | 100 |
Step 3 : Continue dividing by prime numbers till we get 1 in all columns.
| 2 | 55 | 185 | 200 |
| 2 | 55 | 185 | 100 |
| 2 | 55 | 185 | 50 |
| 5 | 55 | 185 | 25 |
| 5 | 11 | 37 | 5 |
| 11 | 11 | 37 | 1 |
| 37 | 1 | 37 | 1 |
| 1 | 1 | 1 |
Step 4 : Multiply numbers in first column to get LCM.
LCM( 55, 185, 200 ) = 2 · 2 · 2 · 5 · 5 · 11 · 37 = 81400 .
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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