The common factor of 21 and 49

The common factor of 21 and 49

The factors of 21 are 1, 3, 7, 21
The factors of 49 are: 1,7,49
In two or more natural numbers, if they have the same factor (except 1), then these factors are called their common factor. Any two natural numbers have a common factor 1. And the largest of these common factors is called the greatest common factor of these positive integers
The common factor of 21 and 49 is 7