All of them are . . . . . 1, 3, 5, and 15 .
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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.
Factors are the numbers you multiple together to get another number. 15: 1, 3, 5, 15
85 has four factors.
The common factors of 15, 45, and 75 are the numbers that can evenly divide all three of these numbers. To find the common factors, you can first determine the prime factors of each number: 15 = 3 x 5, 45 = 3 x 3 x 5, and 75 = 3 x 5 x 5. The common factors are the numbers that appear in the prime factorization of all three numbers, which in this case are 3 and 5.
Any whole number (integer) has factors. Factors are numbers that can be divided into another number. For example the factors of 15 are: 1, 3, 5 and 15 (1 times 15 and 3 times 5)