A:
Positive:
1 x 21520021913 x 1655386371 x 3030989107 x 2011217923 x 2331531391 x 1547092179 x 987617597 x 28327
Negative:
-1 x -215200219-13 x -16553863-71 x -3030989-107 x -2011217-923 x -233153-1391 x -154709-2179 x -98761-7597 x -28327
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 215,200,219, 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 | 215,200,219 | |
| -1 | -215,200,219 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 215,200,219.
Example:
1 x 215,200,219 = 215,200,219
and
-1 x -215,200,219 = 215,200,219
Notice both answers equal 215,200,219
With that explanation out of the way, let's continue. Next, we take the number 215,200,219 and divide it by 2:
215,200,219 ÷ 2 = 107,600,109.5
If the quotient is a whole number, then 2 and 107,600,109.5 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 | 215,200,219 | |
| -1 | -215,200,219 |
Now, we try dividing 215,200,219 by 3:
215,200,219 ÷ 3 = 71,733,406.3333
If the quotient is a whole number, then 3 and 71,733,406.3333 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 | 215,200,219 | |
| -1 | -215,200,219 |
Let's try dividing by 4:
215,200,219 ÷ 4 = 53,800,054.75
If the quotient is a whole number, then 4 and 53,800,054.75 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 | 215,200,219 | |
| -1 | 215,200,219 |
If you did it right, you will end up with this table:
| 1 | 13 | 71 | 107 | 923 | 1,391 | 2,179 | 7,597 | 28,327 | 98,761 | 154,709 | 233,153 | 2,011,217 | 3,030,989 | 16,553,863 | 215,200,219 |
| -1 | -13 | -71 | -107 | -923 | -1,391 | -2,179 | -7,597 | -28,327 | -98,761 | -154,709 | -233,153 | -2,011,217 | -3,030,989 | -16,553,863 | -215,200,219 |
Here are some more numbers to try:
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