A:
Positive:
1 x 2518316055 x 5036632119 x 1325429595 x 2650859149 x 1690145745 x 3380292831 x 8895514155 x 17791
Negative:
-1 x -251831605-5 x -50366321-19 x -13254295-95 x -2650859-149 x -1690145-745 x -338029-2831 x -88955-14155 x -17791
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 251,831,605, 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 | 251,831,605 | |
| -1 | -251,831,605 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 251,831,605.
Example:
1 x 251,831,605 = 251,831,605
and
-1 x -251,831,605 = 251,831,605
Notice both answers equal 251,831,605
With that explanation out of the way, let's continue. Next, we take the number 251,831,605 and divide it by 2:
251,831,605 ÷ 2 = 125,915,802.5
If the quotient is a whole number, then 2 and 125,915,802.5 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 | 251,831,605 | |
| -1 | -251,831,605 |
Now, we try dividing 251,831,605 by 3:
251,831,605 ÷ 3 = 83,943,868.3333
If the quotient is a whole number, then 3 and 83,943,868.3333 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 | 251,831,605 | |
| -1 | -251,831,605 |
Let's try dividing by 4:
251,831,605 ÷ 4 = 62,957,901.25
If the quotient is a whole number, then 4 and 62,957,901.25 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 | 251,831,605 | |
| -1 | 251,831,605 |
If you did it right, you will end up with this table:
| 1 | 5 | 19 | 95 | 149 | 745 | 2,831 | 14,155 | 17,791 | 88,955 | 338,029 | 1,690,145 | 2,650,859 | 13,254,295 | 50,366,321 | 251,831,605 |
| -1 | -5 | -19 | -95 | -149 | -745 | -2,831 | -14,155 | -17,791 | -88,955 | -338,029 | -1,690,145 | -2,650,859 | -13,254,295 | -50,366,321 | -251,831,605 |
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