A:
Positive:
1 x 6388255 x 12776511 x 5807523 x 2777525 x 2555355 x 11615101 x 6325115 x 5555253 x 2525275 x 2323505 x 1265575 x 1111
Negative:
-1 x -638825-5 x -127765-11 x -58075-23 x -27775-25 x -25553-55 x -11615-101 x -6325-115 x -5555-253 x -2525-275 x -2323-505 x -1265-575 x -1111
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 638,825, 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 | 638,825 | |
| -1 | -638,825 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 638,825.
Example:
1 x 638,825 = 638,825
and
-1 x -638,825 = 638,825
Notice both answers equal 638,825
With that explanation out of the way, let's continue. Next, we take the number 638,825 and divide it by 2:
638,825 ÷ 2 = 319,412.5
If the quotient is a whole number, then 2 and 319,412.5 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 | 638,825 | |
| -1 | -638,825 |
Now, we try dividing 638,825 by 3:
638,825 ÷ 3 = 212,941.6667
If the quotient is a whole number, then 3 and 212,941.6667 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 | 638,825 | |
| -1 | -638,825 |
Let's try dividing by 4:
638,825 ÷ 4 = 159,706.25
If the quotient is a whole number, then 4 and 159,706.25 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 | 638,825 | |
| -1 | 638,825 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 23 | 25 | 55 | 101 | 115 | 253 | 275 | 505 | 575 | 1,111 | 1,265 | 2,323 | 2,525 | 5,555 | 6,325 | 11,615 | 25,553 | 27,775 | 58,075 | 127,765 | 638,825 |
| -1 | -5 | -11 | -23 | -25 | -55 | -101 | -115 | -253 | -275 | -505 | -575 | -1,111 | -1,265 | -2,323 | -2,525 | -5,555 | -6,325 | -11,615 | -25,553 | -27,775 | -58,075 | -127,765 | -638,825 |
Here are some more numbers to try:
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