Q: What are the factor combinations of the number 315,479?

 A:
Positive:   1 x 315479389 x 811
Negative: -1 x -315479-389 x -811


How do I find the factor combinations of the number 315,479?

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 315,479, 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.

1 315,479
-1 -315,479

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 315,479.

Example:
1 x 315,479 = 315,479
and
-1 x -315,479 = 315,479
Notice both answers equal 315,479

With that explanation out of the way, let's continue. Next, we take the number 315,479 and divide it by 2:

315,479 ÷ 2 = 157,739.5

If the quotient is a whole number, then 2 and 157,739.5 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:

1 315,479
-1 -315,479

Now, we try dividing 315,479 by 3:

315,479 ÷ 3 = 105,159.6667

If the quotient is a whole number, then 3 and 105,159.6667 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:

1 315,479
-1 -315,479

Let's try dividing by 4:

315,479 ÷ 4 = 78,869.75

If the quotient is a whole number, then 4 and 78,869.75 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:

1 315,479
-1 315,479
Keep dividing by the next highest number until you cannot divide anymore.

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

1389811315,479
-1-389-811-315,479

More Examples

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