A:
Positive:
1 x 2514637455 x 5029274913 x 1934336517 x 1479198565 x 386867385 x 2958397221 x 11378451105 x 227569
Negative:
-1 x -251463745-5 x -50292749-13 x -19343365-17 x -14791985-65 x -3868673-85 x -2958397-221 x -1137845-1105 x -227569
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 251,463,745, 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 | 251,463,745 | |
| -1 | -251,463,745 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 251,463,745.
Example:
1 x 251,463,745 = 251,463,745
and
-1 x -251,463,745 = 251,463,745
Notice both answers equal 251,463,745
With that explanation out of the way, let's continue. Next, we take the number 251,463,745 and divide it by 2:
251,463,745 ÷ 2 = 125,731,872.5
If the quotient is a whole number, then 2 and 125,731,872.5 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 | 251,463,745 | |
| -1 | -251,463,745 |
Now, we try dividing 251,463,745 by 3:
251,463,745 ÷ 3 = 83,821,248.3333
If the quotient is a whole number, then 3 and 83,821,248.3333 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 | 251,463,745 | |
| -1 | -251,463,745 |
Let's try dividing by 4:
251,463,745 ÷ 4 = 62,865,936.25
If the quotient is a whole number, then 4 and 62,865,936.25 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 | 251,463,745 | |
| -1 | 251,463,745 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 17 | 65 | 85 | 221 | 1,105 | 227,569 | 1,137,845 | 2,958,397 | 3,868,673 | 14,791,985 | 19,343,365 | 50,292,749 | 251,463,745 |
| -1 | -5 | -13 | -17 | -65 | -85 | -221 | -1,105 | -227,569 | -1,137,845 | -2,958,397 | -3,868,673 | -14,791,985 | -19,343,365 | -50,292,749 | -251,463,745 |
Here are some more numbers to try:
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