Find Least Common Multiple of 4, 1, 5, 1, 5 and 4 using prime factorisation method.
Answer
LCM( 4, 1, 5, 1, 5, 4 ) = 20
Explanation
Step 1: Write down factorisation of each number:
4 = 2 · 2
1 = 1
5 = 5
1 = 1
5 = 5
4 = 2 · 2
Step 2 : Match primes vertically:
| 4 | = | 2 | · | 2 | ||||
| 1 | = | 1 | ||||||
| 5 | = | 5 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 4 | = | 2 | · | 2 | ||||||
| 1 | = | 1 | ||||||||
| 5 | = | 5 | ||||||||
| LCM | = | 1 | · | 2 | · | 2 | · | 5 | = | 20 |
This page was created using
LCM Calculator