A:
Positive:
1 x 2517201555 x 5034403131 x 8120005103 x 2443885155 x 1624001515 x 4887773193 x 7883515767 x 15965
Negative:
-1 x -251720155-5 x -50344031-31 x -8120005-103 x -2443885-155 x -1624001-515 x -488777-3193 x -78835-15767 x -15965
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 251,720,155, 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 | 251,720,155 | |
| -1 | -251,720,155 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 251,720,155.
Example:
1 x 251,720,155 = 251,720,155
and
-1 x -251,720,155 = 251,720,155
Notice both answers equal 251,720,155
With that explanation out of the way, let's continue. Next, we take the number 251,720,155 and divide it by 2:
251,720,155 ÷ 2 = 125,860,077.5
If the quotient is a whole number, then 2 and 125,860,077.5 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 | 251,720,155 | |
| -1 | -251,720,155 |
Now, we try dividing 251,720,155 by 3:
251,720,155 ÷ 3 = 83,906,718.3333
If the quotient is a whole number, then 3 and 83,906,718.3333 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 | 251,720,155 | |
| -1 | -251,720,155 |
Let's try dividing by 4:
251,720,155 ÷ 4 = 62,930,038.75
If the quotient is a whole number, then 4 and 62,930,038.75 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 | 251,720,155 | |
| -1 | 251,720,155 |
If you did it right, you will end up with this table:
| 1 | 5 | 31 | 103 | 155 | 515 | 3,193 | 15,767 | 15,965 | 78,835 | 488,777 | 1,624,001 | 2,443,885 | 8,120,005 | 50,344,031 | 251,720,155 |
| -1 | -5 | -31 | -103 | -155 | -515 | -3,193 | -15,767 | -15,965 | -78,835 | -488,777 | -1,624,001 | -2,443,885 | -8,120,005 | -50,344,031 | -251,720,155 |
Here are some more numbers to try:
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