Q: What are the factor combinations of the number 12,719?

 A:
Positive:   1 x 127197 x 181723 x 55379 x 161
Negative: -1 x -12719-7 x -1817-23 x -553-79 x -161


How do I find the factor combinations of the number 12,719?

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 12,719, 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 12,719
-1 -12,719

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 12,719.

Example:
1 x 12,719 = 12,719
and
-1 x -12,719 = 12,719
Notice both answers equal 12,719

With that explanation out of the way, let's continue. Next, we take the number 12,719 and divide it by 2:

12,719 ÷ 2 = 6,359.5

If the quotient is a whole number, then 2 and 6,359.5 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 12,719
-1 -12,719

Now, we try dividing 12,719 by 3:

12,719 ÷ 3 = 4,239.6667

If the quotient is a whole number, then 3 and 4,239.6667 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 12,719
-1 -12,719

Let's try dividing by 4:

12,719 ÷ 4 = 3,179.75

If the quotient is a whole number, then 4 and 3,179.75 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 12,719
-1 12,719
Keep dividing by the next highest number until you cannot divide anymore.

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

1723791615531,81712,719
-1-7-23-79-161-553-1,817-12,719

More Examples

Here are some more numbers to try:

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