Question
Find Least Common Multiple of 620, 360, 400 and 240 using division method..
Answer
LCM( 620, 360, 400, 240 ) = 111600
Explanation
Step 1 : Write the given numbers in a horizontal line.
| 620 | 360 | 400 | 240 |
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 | 620 | 360 | 400 | 240 |
| 310 | 180 | 200 | 120 |
Step 3 : Continue dividing by prime numbers till we get 1 in all columns.
| 2 | 620 | 360 | 400 | 240 |
| 2 | 310 | 180 | 200 | 120 |
| 2 | 155 | 90 | 100 | 60 |
| 2 | 155 | 45 | 50 | 30 |
| 3 | 155 | 45 | 25 | 15 |
| 3 | 155 | 15 | 25 | 5 |
| 5 | 155 | 5 | 25 | 5 |
| 5 | 31 | 1 | 5 | 1 |
| 31 | 31 | 1 | 1 | 1 |
| 1 | 1 | 1 | 1 |
Step 4 : Multiply numbers in first column to get LCM.
LCM( 620, 360, 400, 240 ) = 2 · 2 · 2 · 2 · 3 · 3 · 5 · 5 · 31 = 111600 .
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