A:
Positive:
1 x 2154503055 x 430900617 x 3077861535 x 615572349 x 4396945245 x 879389343 x 6281351715 x 125627
Negative:
-1 x -215450305-5 x -43090061-7 x -30778615-35 x -6155723-49 x -4396945-245 x -879389-343 x -628135-1715 x -125627
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 215,450,305, 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 | 215,450,305 | |
| -1 | -215,450,305 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 215,450,305.
Example:
1 x 215,450,305 = 215,450,305
and
-1 x -215,450,305 = 215,450,305
Notice both answers equal 215,450,305
With that explanation out of the way, let's continue. Next, we take the number 215,450,305 and divide it by 2:
215,450,305 ÷ 2 = 107,725,152.5
If the quotient is a whole number, then 2 and 107,725,152.5 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 | 215,450,305 | |
| -1 | -215,450,305 |
Now, we try dividing 215,450,305 by 3:
215,450,305 ÷ 3 = 71,816,768.3333
If the quotient is a whole number, then 3 and 71,816,768.3333 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 | 215,450,305 | |
| -1 | -215,450,305 |
Let's try dividing by 4:
215,450,305 ÷ 4 = 53,862,576.25
If the quotient is a whole number, then 4 and 53,862,576.25 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 | 215,450,305 | |
| -1 | 215,450,305 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 49 | 245 | 343 | 1,715 | 125,627 | 628,135 | 879,389 | 4,396,945 | 6,155,723 | 30,778,615 | 43,090,061 | 215,450,305 |
| -1 | -5 | -7 | -35 | -49 | -245 | -343 | -1,715 | -125,627 | -628,135 | -879,389 | -4,396,945 | -6,155,723 | -30,778,615 | -43,090,061 | -215,450,305 |
Here are some more numbers to try:
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