A:
Positive:
1 x 7812083155 x 156241663151 x 5173565173 x 4515655755 x 1034713865 x 9031315981 x 13061526123 x 29905
Negative:
-1 x -781208315-5 x -156241663-151 x -5173565-173 x -4515655-755 x -1034713-865 x -903131-5981 x -130615-26123 x -29905
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 781,208,315, 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 | 781,208,315 | |
| -1 | -781,208,315 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 781,208,315.
Example:
1 x 781,208,315 = 781,208,315
and
-1 x -781,208,315 = 781,208,315
Notice both answers equal 781,208,315
With that explanation out of the way, let's continue. Next, we take the number 781,208,315 and divide it by 2:
781,208,315 ÷ 2 = 390,604,157.5
If the quotient is a whole number, then 2 and 390,604,157.5 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 | 781,208,315 | |
| -1 | -781,208,315 |
Now, we try dividing 781,208,315 by 3:
781,208,315 ÷ 3 = 260,402,771.6667
If the quotient is a whole number, then 3 and 260,402,771.6667 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 | 781,208,315 | |
| -1 | -781,208,315 |
Let's try dividing by 4:
781,208,315 ÷ 4 = 195,302,078.75
If the quotient is a whole number, then 4 and 195,302,078.75 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 | 781,208,315 | |
| -1 | 781,208,315 |
If you did it right, you will end up with this table:
| 1 | 5 | 151 | 173 | 755 | 865 | 5,981 | 26,123 | 29,905 | 130,615 | 903,131 | 1,034,713 | 4,515,655 | 5,173,565 | 156,241,663 | 781,208,315 |
| -1 | -5 | -151 | -173 | -755 | -865 | -5,981 | -26,123 | -29,905 | -130,615 | -903,131 | -1,034,713 | -4,515,655 | -5,173,565 | -156,241,663 | -781,208,315 |
Here are some more numbers to try:
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