# What are two numbers called having only 1 as a common factor?

## What are two numbers called having only 1 as a common factor?

Two numbers having only 1 as common factor are called Prime numbers. Prime number is whole number greater than 1 and it has only factors 1 and itself.

What does it mean to have a greatest common factor of 1?

If their greatest common factor is 1, then one of the two numbers must be a prime number. Their least common multiple must be the product of the two numbers. For example: 5 and 7 are prime numbers because their only factors are 1 and themselves.

Which is the common factor of 1?

The number 1 has only one factor which is 1 and 1 is a common factor to all numbers.

### Can 1 be a greatest common factor?

GCF stands for Greatest Common Factor. Since 1 is a factor of every number, any two or more numbers have a GCF, because even if the numbers are prime, or if they don’t share any prime factors, then the GCF will be 1.

Which is a common factor 1 and 2?

The HCF of 1 and 2 is 1. To calculate the Highest common factor (HCF) of 1 and 2, we need to factor each number (factor of 1 = 1; factors of 2 = 1, 2) and choose the highest factor that exactly divides both 1 and 2, i.e., 1.

What do you call a number with only 1 factor?

A prime number is a counting number greater than 1 whose only factors are 1 and itself. A composite number is a counting number that is not prime.

## What is an example of greatest common factor?

The greatest common factor (GCF) of a set of numbers is the largest factor that all the numbers share. For example, 12, 20, and 24 have two common factors: 2 and 4. The largest is 4, so we say that the GCF of 12, 20, and 24 is 4.

How do you find the greatest common factor of 1 Number?

Here’s how to find the GCF of a set of numbers using prime factorization:

1. List the prime factors of each number.
2. Circle every common prime factor — that is, every prime factor that’s a factor of every number in the set.
3. Multiply all the circled numbers. The result is the GCF.

Is 1 a factor of every number?

As we know Factors are all the numbers that divide a number completely, i.e., without leaving any remainder, are called factors of that number. From the above data, we observe that 1 is the greatest factor of itself and the smallest factor of any other number. Therefore, 1 is the factor of every number.

### Which pair of numbers has a highest common factor is 1?

In a pair of co-prime numbers, the numbers can be both prime and composite numbers. So, the required solution is co primes. Therefore, the correct answer is option A. Note: Twin prime numbers also have only common factor 1.

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