A:
Positive:
1 x 2515130155 x 5030260313 x 1934715565 x 3869431233 x 10794551165 x 2158913029 x 8303515145 x 16607
Negative:
-1 x -251513015-5 x -50302603-13 x -19347155-65 x -3869431-233 x -1079455-1165 x -215891-3029 x -83035-15145 x -16607
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 251,513,015, 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 | 251,513,015 | |
| -1 | -251,513,015 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 251,513,015.
Example:
1 x 251,513,015 = 251,513,015
and
-1 x -251,513,015 = 251,513,015
Notice both answers equal 251,513,015
With that explanation out of the way, let's continue. Next, we take the number 251,513,015 and divide it by 2:
251,513,015 ÷ 2 = 125,756,507.5
If the quotient is a whole number, then 2 and 125,756,507.5 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 | 251,513,015 | |
| -1 | -251,513,015 |
Now, we try dividing 251,513,015 by 3:
251,513,015 ÷ 3 = 83,837,671.6667
If the quotient is a whole number, then 3 and 83,837,671.6667 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 | 251,513,015 | |
| -1 | -251,513,015 |
Let's try dividing by 4:
251,513,015 ÷ 4 = 62,878,253.75
If the quotient is a whole number, then 4 and 62,878,253.75 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 | 251,513,015 | |
| -1 | 251,513,015 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 65 | 233 | 1,165 | 3,029 | 15,145 | 16,607 | 83,035 | 215,891 | 1,079,455 | 3,869,431 | 19,347,155 | 50,302,603 | 251,513,015 |
| -1 | -5 | -13 | -65 | -233 | -1,165 | -3,029 | -15,145 | -16,607 | -83,035 | -215,891 | -1,079,455 | -3,869,431 | -19,347,155 | -50,302,603 | -251,513,015 |
Here are some more numbers to try:
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