4 is not a factor of 18 and is a factor of both 8 and 12
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1 and 3
All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors because they are factors that the numbers have in common. 3 is a factor of 12. 3 is a factor of 15. 3 is a common factor of 12 and 15.
12 and 24
Multiple. Factors go into numbers, numbers go into multiples.
Because all of 12's multiples are even numbers, 12 doesn't divide evenly into 16839. Therefore, 12 is not a factor of 16839.