A:
Positive:
1 x 2516416255 x 5032832525 x 1006566537 x 6801125125 x 2013133185 x 1360225925 x 2720454625 x 54409
Negative:
-1 x -251641625-5 x -50328325-25 x -10065665-37 x -6801125-125 x -2013133-185 x -1360225-925 x -272045-4625 x -54409
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 251,641,625, 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 | 251,641,625 | |
| -1 | -251,641,625 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 251,641,625.
Example:
1 x 251,641,625 = 251,641,625
and
-1 x -251,641,625 = 251,641,625
Notice both answers equal 251,641,625
With that explanation out of the way, let's continue. Next, we take the number 251,641,625 and divide it by 2:
251,641,625 ÷ 2 = 125,820,812.5
If the quotient is a whole number, then 2 and 125,820,812.5 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 | 251,641,625 | |
| -1 | -251,641,625 |
Now, we try dividing 251,641,625 by 3:
251,641,625 ÷ 3 = 83,880,541.6667
If the quotient is a whole number, then 3 and 83,880,541.6667 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 | 251,641,625 | |
| -1 | -251,641,625 |
Let's try dividing by 4:
251,641,625 ÷ 4 = 62,910,406.25
If the quotient is a whole number, then 4 and 62,910,406.25 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 | 251,641,625 | |
| -1 | 251,641,625 |
If you did it right, you will end up with this table:
| 1 | 5 | 25 | 37 | 125 | 185 | 925 | 4,625 | 54,409 | 272,045 | 1,360,225 | 2,013,133 | 6,801,125 | 10,065,665 | 50,328,325 | 251,641,625 |
| -1 | -5 | -25 | -37 | -125 | -185 | -925 | -4,625 | -54,409 | -272,045 | -1,360,225 | -2,013,133 | -6,801,125 | -10,065,665 | -50,328,325 | -251,641,625 |
Here are some more numbers to try:
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