# What is the HCF of 1 and 2?

HCF (Highest Common Factor) of 1 and 2 is the greatest possible number which divides both 1 and 2 exactly.

## Answer: HCF of 1 and 2 is 1

## Explanation

The highest common factor (HCF) of two numbers a and b is the highest possible number that divides the numbers a and b exactly, leaving the remainder 0.

## Methods to Find HCF of 1 and 2

### HCF of 1 and 2 by Listing the Common Factors

Factors of 1: 1

Factors of 2: 1, 2

Common Factors of 1 and 2: 1

Since the greatest common factor is 1, the HCF of 1 and 2 is 1

So, HCF of 1 and 2 is 1

### HCF of 1 and 2 by Prime Factorization

Prime factorization of 1: 1

Prime factorization of 2: 1 × 2

The common factor in the prime factorization of 1 and 2 is 1

HCF is the product of the factors that are common to each of the given numbers.

So, HCF of 1 and 2 is 1

You can find the HCF in any of the above methods but the solution will be the same.