A:
Positive:
1 x 3200121255 x 6400242525 x 12800485125 x 2560097443 x 7223752215 x 1444755779 x 5537511075 x 28895
Negative:
-1 x -320012125-5 x -64002425-25 x -12800485-125 x -2560097-443 x -722375-2215 x -144475-5779 x -55375-11075 x -28895
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 320,012,125, 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 | 320,012,125 | |
| -1 | -320,012,125 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 320,012,125.
Example:
1 x 320,012,125 = 320,012,125
and
-1 x -320,012,125 = 320,012,125
Notice both answers equal 320,012,125
With that explanation out of the way, let's continue. Next, we take the number 320,012,125 and divide it by 2:
320,012,125 ÷ 2 = 160,006,062.5
If the quotient is a whole number, then 2 and 160,006,062.5 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 | 320,012,125 | |
| -1 | -320,012,125 |
Now, we try dividing 320,012,125 by 3:
320,012,125 ÷ 3 = 106,670,708.3333
If the quotient is a whole number, then 3 and 106,670,708.3333 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 | 320,012,125 | |
| -1 | -320,012,125 |
Let's try dividing by 4:
320,012,125 ÷ 4 = 80,003,031.25
If the quotient is a whole number, then 4 and 80,003,031.25 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 | 320,012,125 | |
| -1 | 320,012,125 |
If you did it right, you will end up with this table:
| 1 | 5 | 25 | 125 | 443 | 2,215 | 5,779 | 11,075 | 28,895 | 55,375 | 144,475 | 722,375 | 2,560,097 | 12,800,485 | 64,002,425 | 320,012,125 |
| -1 | -5 | -25 | -125 | -443 | -2,215 | -5,779 | -11,075 | -28,895 | -55,375 | -144,475 | -722,375 | -2,560,097 | -12,800,485 | -64,002,425 | -320,012,125 |
Here are some more numbers to try:
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