Find Least Common Multiple of 3, 9 and 15 using prime factorisation method.
Answer
LCM( 3, 9, 15 ) = 45
Explanation
Step 1: Write down factorisation of each number:
3 = 3
9 = 3 · 3
15 = 3 · 5
Step 2 : Match primes vertically:
| 3 | = | 3 | ||||
| 9 | = | 3 | · | 3 | ||
| 15 | = | 3 | · | 5 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 3 | = | 3 | ||||||
| 9 | = | 3 | · | 3 | ||||
| 15 | = | 3 | · | 5 | ||||
| LCM | = | 3 | · | 3 | · | 5 | = | 45 |
This solution can be visualized using a Venn diagram.
The LCM is equal to the product of all the numbers on the diagram.
This page was created using
LCM Calculator