Question
Find Least Common Multiple of 14, 7, 7 and 15 using ladder method..
Answer
LCM( 14, 7, 7, 15 ) = 210
Explanation
Step 1 : Place the numbers inside division bar:
| 14 | 7 | 7 | 15 |
Step 2 : Find a prime number which can divide at least two of your numbers.
In this example we can divide by 7. If any number is not divisible by 7 write it down unchanged.
| 7 | 14 | 7 | 7 | 15 |
| 2 | 1 | 1 | 15 |
Step 4 : LCM is a product of numbers into L shape.
| 7 | 14 | 7 | 7 | 15 |
| 2 | 1 | 1 | 15 |
LCM = 7 · 2 · 1 · 1 · 15 = 210
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