Key Points

1. The Highest Common Factor (HCF) of two or more given numbers is the highest (or greatest) of their common factors. It is also known as Greatest Common Divisor (GCD).

2. HCF of numbers can also be found by prime factorization of the numbers.

3. HCF of numbers can also be found by Division Method.

4. HCF of any two consecutive numbers is 1.

5. HCF of two consecutive even numbers is 2.

6. HCF of two consecutive odd numbers is 1.

7. HCF of two prime numbers is 1.

8. HCF of an even number and an odd number is 1.


Last modified: Sunday, 28 October 2018, 9:03 PM