Find Least Common Multiple of 2, 4, 6, 8, 10 and 12 using ladder method..
Answer
LCM( 2, 4, 6, 8, 10, 12 ) = 120
Explanation
Step 1 : Place the numbers inside division bar:
| 2 | 4 | 6 | 8 | 10 | 12 |
Step 2 : Find a prime number which can divide at least two of your numbers.
In this example we can divide by 2. If any number is not divisible by 2 write it down unchanged.
| 2 | 2 | 4 | 6 | 8 | 10 | 12 |
| 1 | 2 | 3 | 4 | 5 | 6 |
Step 3 : Repeat Step 2 until you can no longer divide.
| 2 | 2 | 4 | 6 | 8 | 10 | 12 |
| 2 | 1 | 2 | 3 | 4 | 5 | 6 |
| 1 | 1 | 3 | 2 | 5 | 3 |
| 2 | 2 | 4 | 6 | 8 | 10 | 12 |
| 2 | 1 | 2 | 3 | 4 | 5 | 6 |
| 3 | 1 | 1 | 3 | 2 | 5 | 3 |
| 1 | 1 | 1 | 2 | 5 | 1 |
Since there are no primes that divides at least two of given numbers, we conclude that the LCM is a product of starting numbers.
LCM = 2 · 4 · 6 · 8 · 10 · 12 = 120
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