Why 2 is a common factor of 12 and 24?

2 is a common factor of 12 and 24 because it can evenly divide both numbers without any remainder. This is because 12 is equal to 2 multiplied by 6, and 24 is equal to 2 multiplied by 12. Since 2 is a factor of both 12 and 24, it is considered a common factor of the two numbers.