How to Find LCM or HCF?
To find the LCM (Least Common Multiple) or HCF (Highest Common Factor) of two or more numbers, you can follow the steps below:

Finding LCM:
- List the prime factors: Write down the prime factors of each number.
- Multiply the highest power of all prime factors: Take the highest power of each prime factor that appears in any of the numbers, and multiply them together.
- Example: To find the LCM of 12 and 15, list the prime factors (12 = 2 x 2 x 3, 15 = 3 x 5), then multiply the highest power of each prime factor (2^2 x 3 x 5 = 60), so the LCM of 12 and 15 is 60.

Finding HCF:
- List the prime factors: Write down the prime factors of each number.
- Multiply the lowest power of common prime factors: Take the lowest power of each prime factor that appears in all of the numbers, and multiply them together.
- Example: To find the HCF of 12 and 15, list the prime factors (12 = 2 x 2 x 3, 15 = 3 x 5), then multiply the lowest power of common prime factors (3), so the HCF of 12 and 15 is 3.

Conclusion:
By following these steps, you can easily find the LCM and HCF of any given numbers. It is important to understand the concept of prime factors and how to use them to calculate LCM and HCF effectively.