A:
Positive:
1 x 6886857055 x 137737141107 x 6436315383 x 1798135535 x 12872631915 x 3596273361 x 20490516805 x 40981
Negative:
-1 x -688685705-5 x -137737141-107 x -6436315-383 x -1798135-535 x -1287263-1915 x -359627-3361 x -204905-16805 x -40981
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 688,685,705, 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 | 688,685,705 | |
| -1 | -688,685,705 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 688,685,705.
Example:
1 x 688,685,705 = 688,685,705
and
-1 x -688,685,705 = 688,685,705
Notice both answers equal 688,685,705
With that explanation out of the way, let's continue. Next, we take the number 688,685,705 and divide it by 2:
688,685,705 ÷ 2 = 344,342,852.5
If the quotient is a whole number, then 2 and 344,342,852.5 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 | 688,685,705 | |
| -1 | -688,685,705 |
Now, we try dividing 688,685,705 by 3:
688,685,705 ÷ 3 = 229,561,901.6667
If the quotient is a whole number, then 3 and 229,561,901.6667 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 | 688,685,705 | |
| -1 | -688,685,705 |
Let's try dividing by 4:
688,685,705 ÷ 4 = 172,171,426.25
If the quotient is a whole number, then 4 and 172,171,426.25 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 | 688,685,705 | |
| -1 | 688,685,705 |
If you did it right, you will end up with this table:
| 1 | 5 | 107 | 383 | 535 | 1,915 | 3,361 | 16,805 | 40,981 | 204,905 | 359,627 | 1,287,263 | 1,798,135 | 6,436,315 | 137,737,141 | 688,685,705 |
| -1 | -5 | -107 | -383 | -535 | -1,915 | -3,361 | -16,805 | -40,981 | -204,905 | -359,627 | -1,287,263 | -1,798,135 | -6,436,315 | -137,737,141 | -688,685,705 |
Here are some more numbers to try:
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