Question
Find Least Common Multiple of 2, 36, 10 and 18 using prime factorisation method.
Answer
LCM( 2, 36, 10, 18 ) = 180
Explanation
Step 1: Write down factorisation of each number:
2 = 2
36 = 2 · 2 · 3 · 3
10 = 2 · 5
18 = 2 · 3 · 3
Step 2 : Match primes vertically:
| 2 | = | 2 | ||||||||
| 36 | = | 2 | · | 2 | · | 3 | · | 3 | ||
| 10 | = | 2 | · | 5 | ||||||
| 18 | = | 2 | · | 3 | · | 3 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 2 | = | 2 | ||||||||||
| 36 | = | 2 | · | 2 | · | 3 | · | 3 | ||||
| 10 | = | 2 | · | 5 | ||||||||
| 18 | = | 2 | · | 3 | · | 3 | ||||||
| LCM | = | 2 | · | 2 | · | 3 | · | 3 | · | 5 | = | 180 |
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