A:
Positive:
1 x 2514012055 x 5028024111 x 2285465555 x 457093197 x 2591765485 x 5183531067 x 2356155335 x 47123
Negative:
-1 x -251401205-5 x -50280241-11 x -22854655-55 x -4570931-97 x -2591765-485 x -518353-1067 x -235615-5335 x -47123
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 251,401,205, 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 | 251,401,205 | |
| -1 | -251,401,205 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 251,401,205.
Example:
1 x 251,401,205 = 251,401,205
and
-1 x -251,401,205 = 251,401,205
Notice both answers equal 251,401,205
With that explanation out of the way, let's continue. Next, we take the number 251,401,205 and divide it by 2:
251,401,205 ÷ 2 = 125,700,602.5
If the quotient is a whole number, then 2 and 125,700,602.5 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 | 251,401,205 | |
| -1 | -251,401,205 |
Now, we try dividing 251,401,205 by 3:
251,401,205 ÷ 3 = 83,800,401.6667
If the quotient is a whole number, then 3 and 83,800,401.6667 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 | 251,401,205 | |
| -1 | -251,401,205 |
Let's try dividing by 4:
251,401,205 ÷ 4 = 62,850,301.25
If the quotient is a whole number, then 4 and 62,850,301.25 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 | 251,401,205 | |
| -1 | 251,401,205 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 97 | 485 | 1,067 | 5,335 | 47,123 | 235,615 | 518,353 | 2,591,765 | 4,570,931 | 22,854,655 | 50,280,241 | 251,401,205 |
| -1 | -5 | -11 | -55 | -97 | -485 | -1,067 | -5,335 | -47,123 | -235,615 | -518,353 | -2,591,765 | -4,570,931 | -22,854,655 | -50,280,241 | -251,401,205 |
Here are some more numbers to try:
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