A:
Positive:
1 x 2155401355 x 4310802753 x 4066795265 x 813359631 x 3415851289 x 1672153155 x 683176445 x 33443
Negative:
-1 x -215540135-5 x -43108027-53 x -4066795-265 x -813359-631 x -341585-1289 x -167215-3155 x -68317-6445 x -33443
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 215,540,135, 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 | 215,540,135 | |
| -1 | -215,540,135 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 215,540,135.
Example:
1 x 215,540,135 = 215,540,135
and
-1 x -215,540,135 = 215,540,135
Notice both answers equal 215,540,135
With that explanation out of the way, let's continue. Next, we take the number 215,540,135 and divide it by 2:
215,540,135 ÷ 2 = 107,770,067.5
If the quotient is a whole number, then 2 and 107,770,067.5 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 | 215,540,135 | |
| -1 | -215,540,135 |
Now, we try dividing 215,540,135 by 3:
215,540,135 ÷ 3 = 71,846,711.6667
If the quotient is a whole number, then 3 and 71,846,711.6667 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 | 215,540,135 | |
| -1 | -215,540,135 |
Let's try dividing by 4:
215,540,135 ÷ 4 = 53,885,033.75
If the quotient is a whole number, then 4 and 53,885,033.75 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 | 215,540,135 | |
| -1 | 215,540,135 |
If you did it right, you will end up with this table:
| 1 | 5 | 53 | 265 | 631 | 1,289 | 3,155 | 6,445 | 33,443 | 68,317 | 167,215 | 341,585 | 813,359 | 4,066,795 | 43,108,027 | 215,540,135 |
| -1 | -5 | -53 | -265 | -631 | -1,289 | -3,155 | -6,445 | -33,443 | -68,317 | -167,215 | -341,585 | -813,359 | -4,066,795 | -43,108,027 | -215,540,135 |
Here are some more numbers to try:
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