A:
Positive:
1 x 2153562555 x 4307125117 x 1266801543 x 500828585 x 2533603215 x 1001657731 x 2946053655 x 58921
Negative:
-1 x -215356255-5 x -43071251-17 x -12668015-43 x -5008285-85 x -2533603-215 x -1001657-731 x -294605-3655 x -58921
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 215,356,255, 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 | 215,356,255 | |
| -1 | -215,356,255 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 215,356,255.
Example:
1 x 215,356,255 = 215,356,255
and
-1 x -215,356,255 = 215,356,255
Notice both answers equal 215,356,255
With that explanation out of the way, let's continue. Next, we take the number 215,356,255 and divide it by 2:
215,356,255 ÷ 2 = 107,678,127.5
If the quotient is a whole number, then 2 and 107,678,127.5 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 | 215,356,255 | |
| -1 | -215,356,255 |
Now, we try dividing 215,356,255 by 3:
215,356,255 ÷ 3 = 71,785,418.3333
If the quotient is a whole number, then 3 and 71,785,418.3333 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 | 215,356,255 | |
| -1 | -215,356,255 |
Let's try dividing by 4:
215,356,255 ÷ 4 = 53,839,063.75
If the quotient is a whole number, then 4 and 53,839,063.75 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 | 215,356,255 | |
| -1 | 215,356,255 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 43 | 85 | 215 | 731 | 3,655 | 58,921 | 294,605 | 1,001,657 | 2,533,603 | 5,008,285 | 12,668,015 | 43,071,251 | 215,356,255 |
| -1 | -5 | -17 | -43 | -85 | -215 | -731 | -3,655 | -58,921 | -294,605 | -1,001,657 | -2,533,603 | -5,008,285 | -12,668,015 | -43,071,251 | -215,356,255 |
Here are some more numbers to try:
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