A:
Positive:
1 x 6422034055 x 12844068129 x 22144945145 x 4428989631 x 10177553155 x 2035517019 x 9149518299 x 35095
Negative:
-1 x -642203405-5 x -128440681-29 x -22144945-145 x -4428989-631 x -1017755-3155 x -203551-7019 x -91495-18299 x -35095
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 642,203,405, 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 | 642,203,405 | |
| -1 | -642,203,405 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 642,203,405.
Example:
1 x 642,203,405 = 642,203,405
and
-1 x -642,203,405 = 642,203,405
Notice both answers equal 642,203,405
With that explanation out of the way, let's continue. Next, we take the number 642,203,405 and divide it by 2:
642,203,405 ÷ 2 = 321,101,702.5
If the quotient is a whole number, then 2 and 321,101,702.5 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 | 642,203,405 | |
| -1 | -642,203,405 |
Now, we try dividing 642,203,405 by 3:
642,203,405 ÷ 3 = 214,067,801.6667
If the quotient is a whole number, then 3 and 214,067,801.6667 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 | 642,203,405 | |
| -1 | -642,203,405 |
Let's try dividing by 4:
642,203,405 ÷ 4 = 160,550,851.25
If the quotient is a whole number, then 4 and 160,550,851.25 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 | 642,203,405 | |
| -1 | 642,203,405 |
If you did it right, you will end up with this table:
| 1 | 5 | 29 | 145 | 631 | 3,155 | 7,019 | 18,299 | 35,095 | 91,495 | 203,551 | 1,017,755 | 4,428,989 | 22,144,945 | 128,440,681 | 642,203,405 |
| -1 | -5 | -29 | -145 | -631 | -3,155 | -7,019 | -18,299 | -35,095 | -91,495 | -203,551 | -1,017,755 | -4,428,989 | -22,144,945 | -128,440,681 | -642,203,405 |
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