4,6,8,10,12,14,16,18,20,22,24,26
All numbers with 12 as a factor have 2 as a factor, but not all have 10 as a factor.
1 and 3
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.
4 is not a factor of 18 and is a factor of both 8 and 12
2 x 2 x 3
12 and 72
the highest common factor of the numbers 12, 16 and 18 is 2.
2 and 3 are prime numbers that are factors of 12. There is an infinite list of prime numbers that aren't.
24 and 36
6 and 12
2 and 12, among others.
4 and 12 are both even numbers greater than 2. They are composite numbers because 2 is a factor in addition to 1 and itself.