Question
Find Least Common Multiple of 200, 320 and 460 using division method..
Answer
LCM( 200, 320, 460 ) = 36800
Explanation
Step 1 : Write the given numbers in a horizontal line.
| 200 | 320 | 460 |
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 | 200 | 320 | 460 |
| 100 | 160 | 230 |
Step 3 : Continue dividing by prime numbers till we get 1 in all columns.
| 2 | 200 | 320 | 460 |
| 2 | 100 | 160 | 230 |
| 2 | 50 | 80 | 115 |
| 2 | 25 | 40 | 115 |
| 2 | 25 | 20 | 115 |
| 2 | 25 | 10 | 115 |
| 5 | 25 | 5 | 115 |
| 5 | 5 | 1 | 23 |
| 23 | 1 | 1 | 23 |
| 1 | 1 | 1 |
Step 4 : Multiply numbers in first column to get LCM.
LCM( 200, 320, 460 ) = 2 · 2 · 2 · 2 · 2 · 2 · 5 · 5 · 23 = 36800 .
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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