A:
Positive:
1 x 6385862055 x 12771724131 x 2059955559 x 10823495155 x 4119911295 x 21646991829 x 3491459145 x 69829
Negative:
-1 x -638586205-5 x -127717241-31 x -20599555-59 x -10823495-155 x -4119911-295 x -2164699-1829 x -349145-9145 x -69829
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 638,586,205, 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 | 638,586,205 | |
| -1 | -638,586,205 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 638,586,205.
Example:
1 x 638,586,205 = 638,586,205
and
-1 x -638,586,205 = 638,586,205
Notice both answers equal 638,586,205
With that explanation out of the way, let's continue. Next, we take the number 638,586,205 and divide it by 2:
638,586,205 ÷ 2 = 319,293,102.5
If the quotient is a whole number, then 2 and 319,293,102.5 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 | 638,586,205 | |
| -1 | -638,586,205 |
Now, we try dividing 638,586,205 by 3:
638,586,205 ÷ 3 = 212,862,068.3333
If the quotient is a whole number, then 3 and 212,862,068.3333 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 | 638,586,205 | |
| -1 | -638,586,205 |
Let's try dividing by 4:
638,586,205 ÷ 4 = 159,646,551.25
If the quotient is a whole number, then 4 and 159,646,551.25 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 | 638,586,205 | |
| -1 | 638,586,205 |
If you did it right, you will end up with this table:
| 1 | 5 | 31 | 59 | 155 | 295 | 1,829 | 9,145 | 69,829 | 349,145 | 2,164,699 | 4,119,911 | 10,823,495 | 20,599,555 | 127,717,241 | 638,586,205 |
| -1 | -5 | -31 | -59 | -155 | -295 | -1,829 | -9,145 | -69,829 | -349,145 | -2,164,699 | -4,119,911 | -10,823,495 | -20,599,555 | -127,717,241 | -638,586,205 |
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