A:
Positive:
1 x 2155162555 x 4310325129 x 7431595145 x 1486319157 x 1372715785 x 2745434553 x 473359467 x 22765
Negative:
-1 x -215516255-5 x -43103251-29 x -7431595-145 x -1486319-157 x -1372715-785 x -274543-4553 x -47335-9467 x -22765
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 215,516,255, 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 | 215,516,255 | |
| -1 | -215,516,255 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 215,516,255.
Example:
1 x 215,516,255 = 215,516,255
and
-1 x -215,516,255 = 215,516,255
Notice both answers equal 215,516,255
With that explanation out of the way, let's continue. Next, we take the number 215,516,255 and divide it by 2:
215,516,255 ÷ 2 = 107,758,127.5
If the quotient is a whole number, then 2 and 107,758,127.5 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 | 215,516,255 | |
| -1 | -215,516,255 |
Now, we try dividing 215,516,255 by 3:
215,516,255 ÷ 3 = 71,838,751.6667
If the quotient is a whole number, then 3 and 71,838,751.6667 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 | 215,516,255 | |
| -1 | -215,516,255 |
Let's try dividing by 4:
215,516,255 ÷ 4 = 53,879,063.75
If the quotient is a whole number, then 4 and 53,879,063.75 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 | 215,516,255 | |
| -1 | 215,516,255 |
If you did it right, you will end up with this table:
| 1 | 5 | 29 | 145 | 157 | 785 | 4,553 | 9,467 | 22,765 | 47,335 | 274,543 | 1,372,715 | 1,486,319 | 7,431,595 | 43,103,251 | 215,516,255 |
| -1 | -5 | -29 | -145 | -157 | -785 | -4,553 | -9,467 | -22,765 | -47,335 | -274,543 | -1,372,715 | -1,486,319 | -7,431,595 | -43,103,251 | -215,516,255 |
Here are some more numbers to try:
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