A:
Positive:
1 x 2565454155 x 513090837 x 3664934535 x 7329869587 x 4370452935 x 874094109 x 6243512487 x 20545
Negative:
-1 x -256545415-5 x -51309083-7 x -36649345-35 x -7329869-587 x -437045-2935 x -87409-4109 x -62435-12487 x -20545
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 256,545,415, 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 | 256,545,415 | |
| -1 | -256,545,415 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 256,545,415.
Example:
1 x 256,545,415 = 256,545,415
and
-1 x -256,545,415 = 256,545,415
Notice both answers equal 256,545,415
With that explanation out of the way, let's continue. Next, we take the number 256,545,415 and divide it by 2:
256,545,415 ÷ 2 = 128,272,707.5
If the quotient is a whole number, then 2 and 128,272,707.5 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 | 256,545,415 | |
| -1 | -256,545,415 |
Now, we try dividing 256,545,415 by 3:
256,545,415 ÷ 3 = 85,515,138.3333
If the quotient is a whole number, then 3 and 85,515,138.3333 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 | 256,545,415 | |
| -1 | -256,545,415 |
Let's try dividing by 4:
256,545,415 ÷ 4 = 64,136,353.75
If the quotient is a whole number, then 4 and 64,136,353.75 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 | 256,545,415 | |
| -1 | 256,545,415 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 587 | 2,935 | 4,109 | 12,487 | 20,545 | 62,435 | 87,409 | 437,045 | 7,329,869 | 36,649,345 | 51,309,083 | 256,545,415 |
| -1 | -5 | -7 | -35 | -587 | -2,935 | -4,109 | -12,487 | -20,545 | -62,435 | -87,409 | -437,045 | -7,329,869 | -36,649,345 | -51,309,083 | -256,545,415 |
Here are some more numbers to try:
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