Find Least Common Multiple of 140, 240, 360 and 400 using division method..
Answer
LCM( 140, 240, 360, 400 ) = 25200
Explanation
Step 1 : Write the given numbers in a horizontal line.
| 140 | 240 | 360 | 400 |
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 | 140 | 240 | 360 | 400 |
| 70 | 120 | 180 | 200 |
Step 3 : Continue dividing by prime numbers till we get 1 in all columns.
| 2 | 140 | 240 | 360 | 400 |
| 2 | 70 | 120 | 180 | 200 |
| 2 | 35 | 60 | 90 | 100 |
| 2 | 35 | 30 | 45 | 50 |
| 3 | 35 | 15 | 45 | 25 |
| 3 | 35 | 5 | 15 | 25 |
| 5 | 35 | 5 | 5 | 25 |
| 5 | 7 | 1 | 1 | 5 |
| 7 | 7 | 1 | 1 | 1 |
| 1 | 1 | 1 | 1 |
Step 4 : Multiply numbers in first column to get LCM.
LCM( 140, 240, 360, 400 ) = 2 · 2 · 2 · 2 · 3 · 3 · 5 · 5 · 7 = 25200 .
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