A:
Positive:
1 x 312081555 x 624163111 x 283710555 x 567421107 x 291665535 x 583331177 x 265155303 x 5885
Negative:
-1 x -31208155-5 x -6241631-11 x -2837105-55 x -567421-107 x -291665-535 x -58333-1177 x -26515-5303 x -5885
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 31,208,155, 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 | 31,208,155 | |
| -1 | -31,208,155 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 31,208,155.
Example:
1 x 31,208,155 = 31,208,155
and
-1 x -31,208,155 = 31,208,155
Notice both answers equal 31,208,155
With that explanation out of the way, let's continue. Next, we take the number 31,208,155 and divide it by 2:
31,208,155 ÷ 2 = 15,604,077.5
If the quotient is a whole number, then 2 and 15,604,077.5 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 | 31,208,155 | |
| -1 | -31,208,155 |
Now, we try dividing 31,208,155 by 3:
31,208,155 ÷ 3 = 10,402,718.3333
If the quotient is a whole number, then 3 and 10,402,718.3333 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 | 31,208,155 | |
| -1 | -31,208,155 |
Let's try dividing by 4:
31,208,155 ÷ 4 = 7,802,038.75
If the quotient is a whole number, then 4 and 7,802,038.75 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 | 31,208,155 | |
| -1 | 31,208,155 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 107 | 535 | 1,177 | 5,303 | 5,885 | 26,515 | 58,333 | 291,665 | 567,421 | 2,837,105 | 6,241,631 | 31,208,155 |
| -1 | -5 | -11 | -55 | -107 | -535 | -1,177 | -5,303 | -5,885 | -26,515 | -58,333 | -291,665 | -567,421 | -2,837,105 | -6,241,631 | -31,208,155 |
Here are some more numbers to try:
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