Factors are the numbers you multiply to get another number. For instance, the factors of 15 are 3 and 5, because 3×5 = 15. Some numbers have more than one factorization (more than one way of being factored). For instance, 12 can be factored as 1×12, 2×6, or 3×4. A number that can only be factored as 1 and itself is called a prime number. The first few primes are 2, 3, 5, 7, 11, and 13. The number 1 is not regarded as a prime, and is usually not included in factorizations, because 1 goes into everything.

Most people will want to find the prime factorization of a number, the list of all the prime-number factors of a given number. The prime factorization does not include 1, but does include every copy of every prime factor. For instance, the prime factorization of 8 is 2×2×2, not just 2.

If you are working out the factor of 6, which is the first number in this question follow this simple system. You have to find out which 2 numbers multiply to get that number, in the case of 6. The factors would be 1, 2, 3, and 6. 1 times 6=6, and 2 times 3 =6 and so on.

In the case of 5, 5 is a prime number, which can only be divided by 1 and itself. Apply these rules to the other numbers to work out their factors.

Most people will want to find the prime factorization of a number, the list of all the prime-number factors of a given number. The prime factorization does not include 1, but does include every copy of every prime factor. For instance, the prime factorization of 8 is 2×2×2, not just 2.

If you are working out the factor of 6, which is the first number in this question follow this simple system. You have to find out which 2 numbers multiply to get that number, in the case of 6. The factors would be 1, 2, 3, and 6. 1 times 6=6, and 2 times 3 =6 and so on.

In the case of 5, 5 is a prime number, which can only be divided by 1 and itself. Apply these rules to the other numbers to work out their factors.