Find Least Common Multiple of 120, 210, 250 and 350 using prime factorisation method.
Answer
LCM( 120, 210, 250, 350 ) = 21000
Explanation
Step 1: Write down factorisation of each number:
120 = 2 · 2 · 2 · 3 · 5
210 = 2 · 3 · 5 · 7
250 = 2 · 5 · 5 · 5
350 = 2 · 5 · 5 · 7
Step 2 : Match primes vertically:
| 120 | = | 2 | · | 2 | · | 2 | · | 3 | · | 5 | ||||||
| 210 | = | 2 | · | 3 | · | 5 | · | 7 | ||||||||
| 250 | = | 2 | · | 5 | · | 5 | · | 5 | ||||||||
| 350 | = | 2 | · | 5 | · | 5 | · | 7 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 120 | = | 2 | · | 2 | · | 2 | · | 3 | · | 5 | ||||||||
| 210 | = | 2 | · | 3 | · | 5 | · | 7 | ||||||||||
| 250 | = | 2 | · | 5 | · | 5 | · | 5 | ||||||||||
| 350 | = | 2 | · | 5 | · | 5 | · | 7 | ||||||||||
| LCM | = | 2 | · | 2 | · | 2 | · | 3 | · | 5 | · | 5 | · | 5 | · | 7 | = | 21000 |
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