What are the factors of 9?


Quick Answer

The factors of 9 are 1, 3 and 9. A factor is a number that divides into another number evenly. When a person divides 9 by the numbers 9, 3 and 1, it is easy to see that they are factors.

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Full Answer

To find factors of larger numbers, it is useful to know the different divisibility tests. For example, there are tests to see if a given number is divisible by 2, 3, 4, 5, 6, 9 and 10. The divisibility rule for 3 states that a number is divisible by 3 if the sum of its digits also can be divided by 3. By using this rule, it is evident that a number like 27, for which the sum of the digits 2 and 7 is equal to 9, is also divisible by 3.

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