Question
Find Least Common Multiple of 1, 4, 1 and 8 using prime factorisation method.
Answer
LCM( 1, 4, 1, 8 ) = 8
Explanation
Step 1: Write down factorisation of each number:
1 = 1
4 = 2 · 2
1 = 1
8 = 2 · 2 · 2
Step 2 : Match primes vertically:
| 1 | = | 1 | ||||||
| 4 | = | 2 | · | 2 | ||||
| 8 | = | 2 | · | 2 | · | 2 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 1 | = | 1 | ||||||||
| 4 | = | 2 | · | 2 | ||||||
| 8 | = | 2 | · | 2 | · | 2 | ||||
| LCM | = | 1 | · | 2 | · | 2 | · | 2 | = | 8 |
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