Question
Find Least Common Multiple of 820, 520 and 480 using division method..
Answer
LCM( 820, 520, 480 ) = 255840
Explanation
Step 1 : Write the given numbers in a horizontal line.
| 820 | 520 | 480 |
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 | 820 | 520 | 480 |
| 410 | 260 | 240 |
Step 3 : Continue dividing by prime numbers till we get 1 in all columns.
| 2 | 820 | 520 | 480 |
| 2 | 410 | 260 | 240 |
| 2 | 205 | 130 | 120 |
| 2 | 205 | 65 | 60 |
| 2 | 205 | 65 | 30 |
| 3 | 205 | 65 | 15 |
| 5 | 205 | 65 | 5 |
| 13 | 41 | 13 | 1 |
| 41 | 41 | 1 | 1 |
| 1 | 1 | 1 |
Step 4 : Multiply numbers in first column to get LCM.
LCM( 820, 520, 480 ) = 2 · 2 · 2 · 2 · 2 · 3 · 5 · 13 · 41 = 255840 .
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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