A:
Positive:
1 x 129305155 x 258610313 x 99465565 x 198931331 x 39065601 x 215151655 x 78133005 x 4303
Negative:
-1 x -12930515-5 x -2586103-13 x -994655-65 x -198931-331 x -39065-601 x -21515-1655 x -7813-3005 x -4303
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 12,930,515, it is easier to work with a table - it's called factoring from the outside in.
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 | 12,930,515 | |
| -1 | -12,930,515 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 12,930,515.
Example:
1 x 12,930,515 = 12,930,515
and
-1 x -12,930,515 = 12,930,515
Notice both answers equal 12,930,515
With that explanation out of the way, let's continue. Next, we take the number 12,930,515 and divide it by 2:
12,930,515 ÷ 2 = 6,465,257.5
If the quotient is a whole number, then 2 and 6,465,257.5 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 | 12,930,515 | |
| -1 | -12,930,515 |
Now, we try dividing 12,930,515 by 3:
12,930,515 ÷ 3 = 4,310,171.6667
If the quotient is a whole number, then 3 and 4,310,171.6667 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 | 12,930,515 | |
| -1 | -12,930,515 |
Let's try dividing by 4:
12,930,515 ÷ 4 = 3,232,628.75
If the quotient is a whole number, then 4 and 3,232,628.75 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 | 12,930,515 | |
| -1 | 12,930,515 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 65 | 331 | 601 | 1,655 | 3,005 | 4,303 | 7,813 | 21,515 | 39,065 | 198,931 | 994,655 | 2,586,103 | 12,930,515 |
| -1 | -5 | -13 | -65 | -331 | -601 | -1,655 | -3,005 | -4,303 | -7,813 | -21,515 | -39,065 | -198,931 | -994,655 | -2,586,103 | -12,930,515 |
Here are some more numbers to try:
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