Q: What are the factor combinations of the number 231,512?

 A:
Positive:   1 x 2315122 x 1157564 x 578788 x 2893943 x 538486 x 2692172 x 1346344 x 673
Negative: -1 x -231512-2 x -115756-4 x -57878-8 x -28939-43 x -5384-86 x -2692-172 x -1346-344 x -673


How do I find the factor combinations of the number 231,512?

Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 231,512, it is easier to work with a table - it's called factoring from the outside in.

Outside in Factoring

We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.

1 231,512
-1 -231,512

Why are the negative numbers included?

When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 231,512.

Example:
1 x 231,512 = 231,512
and
-1 x -231,512 = 231,512
Notice both answers equal 231,512

With that explanation out of the way, let's continue. Next, we take the number 231,512 and divide it by 2:

231,512 ÷ 2 = 115,756

If the quotient is a whole number, then 2 and 115,756 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!

Here is what our table should look like at this step:

1 2 115,756 231,512
-1 -2 -115,756 -231,512

Now, we try dividing 231,512 by 3:

231,512 ÷ 3 = 77,170.6667

If the quotient is a whole number, then 3 and 77,170.6667 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.

Here is what our table should look like at this step:

1 2 115,756 231,512
-1 -2 -115,756 -231,512

Let's try dividing by 4:

231,512 ÷ 4 = 57,878

If the quotient is a whole number, then 4 and 57,878 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!

Here is what our table should look like at this step:

1 2 4 57,878 115,756 231,512
-1 -2 -4 -57,878 -115,756 231,512
Keep dividing by the next highest number until you cannot divide anymore.

If you did it right, you will end up with this table:

124843861723446731,3462,6925,38428,93957,878115,756231,512
-1-2-4-8-43-86-172-344-673-1,346-2,692-5,384-28,939-57,878-115,756-231,512

More Examples

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