A:
Positive:
1 x 1388458855 x 2776917717 x 816740541 x 338648585 x 1633481205 x 677297697 x 1992053485 x 39841
Negative:
-1 x -138845885-5 x -27769177-17 x -8167405-41 x -3386485-85 x -1633481-205 x -677297-697 x -199205-3485 x -39841
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 138,845,885, 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 | 138,845,885 | |
| -1 | -138,845,885 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 138,845,885.
Example:
1 x 138,845,885 = 138,845,885
and
-1 x -138,845,885 = 138,845,885
Notice both answers equal 138,845,885
With that explanation out of the way, let's continue. Next, we take the number 138,845,885 and divide it by 2:
138,845,885 ÷ 2 = 69,422,942.5
If the quotient is a whole number, then 2 and 69,422,942.5 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 | 138,845,885 | |
| -1 | -138,845,885 |
Now, we try dividing 138,845,885 by 3:
138,845,885 ÷ 3 = 46,281,961.6667
If the quotient is a whole number, then 3 and 46,281,961.6667 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 | 138,845,885 | |
| -1 | -138,845,885 |
Let's try dividing by 4:
138,845,885 ÷ 4 = 34,711,471.25
If the quotient is a whole number, then 4 and 34,711,471.25 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 | 138,845,885 | |
| -1 | 138,845,885 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 41 | 85 | 205 | 697 | 3,485 | 39,841 | 199,205 | 677,297 | 1,633,481 | 3,386,485 | 8,167,405 | 27,769,177 | 138,845,885 |
| -1 | -5 | -17 | -41 | -85 | -205 | -697 | -3,485 | -39,841 | -199,205 | -677,297 | -1,633,481 | -3,386,485 | -8,167,405 | -27,769,177 | -138,845,885 |
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