A:
Positive:
1 x 2801213755 x 5602427525 x 11204855103 x 2719625125 x 2240971515 x 5439252575 x 10878512875 x 21757
Negative:
-1 x -280121375-5 x -56024275-25 x -11204855-103 x -2719625-125 x -2240971-515 x -543925-2575 x -108785-12875 x -21757
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 280,121,375, 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 | 280,121,375 | |
| -1 | -280,121,375 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 280,121,375.
Example:
1 x 280,121,375 = 280,121,375
and
-1 x -280,121,375 = 280,121,375
Notice both answers equal 280,121,375
With that explanation out of the way, let's continue. Next, we take the number 280,121,375 and divide it by 2:
280,121,375 ÷ 2 = 140,060,687.5
If the quotient is a whole number, then 2 and 140,060,687.5 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 | 280,121,375 | |
| -1 | -280,121,375 |
Now, we try dividing 280,121,375 by 3:
280,121,375 ÷ 3 = 93,373,791.6667
If the quotient is a whole number, then 3 and 93,373,791.6667 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 | 280,121,375 | |
| -1 | -280,121,375 |
Let's try dividing by 4:
280,121,375 ÷ 4 = 70,030,343.75
If the quotient is a whole number, then 4 and 70,030,343.75 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 | 280,121,375 | |
| -1 | 280,121,375 |
If you did it right, you will end up with this table:
| 1 | 5 | 25 | 103 | 125 | 515 | 2,575 | 12,875 | 21,757 | 108,785 | 543,925 | 2,240,971 | 2,719,625 | 11,204,855 | 56,024,275 | 280,121,375 |
| -1 | -5 | -25 | -103 | -125 | -515 | -2,575 | -12,875 | -21,757 | -108,785 | -543,925 | -2,240,971 | -2,719,625 | -11,204,855 | -56,024,275 | -280,121,375 |
Here are some more numbers to try:
Try the factor calculator