# Greatest Common Factor of 7, 15, 21

GCF of two or more numbers Calculator allows you to quickly calculate the GCF of 7, 15, 21 i.e. 1 largest integer that divides all the numbers equally.

Greatest common factor (GCF) of 7, 15, 21 is 1.

GCF(7, 15, 21) = 1

## GCF of 7, 15, 21

Greatest common factor or Greatest common divisor (GCD) can be calculated in two ways

GCF of:

### Greatest Common Factor (GCF) of 7,15,21 By Common Division

∴ GCF of numbers is 1 because of no common factors present between them.

### Greatest Common Factor (GCF) By Matching Biggest Common Factor Method

Factors of 7

List of positive integer factors of 7 that divides 7 without a remainder.

1,7

Factors of 15

List of positive integer factors of 15 that divides 15 without a remainder.

1,3,5,15

Factors of 21

List of positive integer factors of 21 that divides 21 without a remainder.

1,3,7,21

Greatest Common Factor

We found the factors 7,15,21 . The biggest common factor number is the GCF number.
So the greatest common factor 7,15,21 is 1.

### GCF of two or more Numbers Calculation Examples

Here are some samples of GCF of two or more Numbers calculations.

### Frequently Asked Questions on GCF of 7, 15, 21

1. What is the GCF of 7, 15, 21?

Answer: GCF of 7, 15, 21 is 1.

2. How to Find the GCF of 7, 15, 21

Answer: Greatest Common Factor(GCF) of 7, 15, 21 = 1

Step 1: Divide all the numbers with common prime numbers having remainder zero.

Step 2: Then multiply all the prime factors GCF(7, 15, 21) = 1.