A:
Positive:
1 x 251211555 x 502423117 x 147771585 x 295543479 x 52445617 x 407152395 x 104893085 x 8143
Negative:
-1 x -25121155-5 x -5024231-17 x -1477715-85 x -295543-479 x -52445-617 x -40715-2395 x -10489-3085 x -8143
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 25,121,155, 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 | 25,121,155 | |
| -1 | -25,121,155 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 25,121,155.
Example:
1 x 25,121,155 = 25,121,155
and
-1 x -25,121,155 = 25,121,155
Notice both answers equal 25,121,155
With that explanation out of the way, let's continue. Next, we take the number 25,121,155 and divide it by 2:
25,121,155 ÷ 2 = 12,560,577.5
If the quotient is a whole number, then 2 and 12,560,577.5 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 | 25,121,155 | |
| -1 | -25,121,155 |
Now, we try dividing 25,121,155 by 3:
25,121,155 ÷ 3 = 8,373,718.3333
If the quotient is a whole number, then 3 and 8,373,718.3333 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 | 25,121,155 | |
| -1 | -25,121,155 |
Let's try dividing by 4:
25,121,155 ÷ 4 = 6,280,288.75
If the quotient is a whole number, then 4 and 6,280,288.75 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 | 25,121,155 | |
| -1 | 25,121,155 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 85 | 479 | 617 | 2,395 | 3,085 | 8,143 | 10,489 | 40,715 | 52,445 | 295,543 | 1,477,715 | 5,024,231 | 25,121,155 |
| -1 | -5 | -17 | -85 | -479 | -617 | -2,395 | -3,085 | -8,143 | -10,489 | -40,715 | -52,445 | -295,543 | -1,477,715 | -5,024,231 | -25,121,155 |
Here are some more numbers to try:
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