Q: What are the factor combinations of the number 145,717?

 A:
Positive:   1 x 14571711 x 1324713 x 11209143 x 1019
Negative: -1 x -145717-11 x -13247-13 x -11209-143 x -1019


How do I find the factor combinations of the number 145,717?

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 145,717, 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.

1 145,717
-1 -145,717

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 145,717.

Example:
1 x 145,717 = 145,717
and
-1 x -145,717 = 145,717
Notice both answers equal 145,717

With that explanation out of the way, let's continue. Next, we take the number 145,717 and divide it by 2:

145,717 ÷ 2 = 72,858.5

If the quotient is a whole number, then 2 and 72,858.5 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:

1 145,717
-1 -145,717

Now, we try dividing 145,717 by 3:

145,717 ÷ 3 = 48,572.3333

If the quotient is a whole number, then 3 and 48,572.3333 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:

1 145,717
-1 -145,717

Let's try dividing by 4:

145,717 ÷ 4 = 36,429.25

If the quotient is a whole number, then 4 and 36,429.25 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:

1 145,717
-1 145,717
Keep dividing by the next highest number until you cannot divide anymore.

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

111131431,01911,20913,247145,717
-1-11-13-143-1,019-11,209-13,247-145,717

More Examples

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