A:
Positive:
1 x 1989392155 x 3978784319 x 1047048595 x 2094097107 x 1859245535 x 3718492033 x 9785510165 x 19571
Negative:
-1 x -198939215-5 x -39787843-19 x -10470485-95 x -2094097-107 x -1859245-535 x -371849-2033 x -97855-10165 x -19571
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 198,939,215, 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 | 198,939,215 | |
| -1 | -198,939,215 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 198,939,215.
Example:
1 x 198,939,215 = 198,939,215
and
-1 x -198,939,215 = 198,939,215
Notice both answers equal 198,939,215
With that explanation out of the way, let's continue. Next, we take the number 198,939,215 and divide it by 2:
198,939,215 ÷ 2 = 99,469,607.5
If the quotient is a whole number, then 2 and 99,469,607.5 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 | 198,939,215 | |
| -1 | -198,939,215 |
Now, we try dividing 198,939,215 by 3:
198,939,215 ÷ 3 = 66,313,071.6667
If the quotient is a whole number, then 3 and 66,313,071.6667 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 | 198,939,215 | |
| -1 | -198,939,215 |
Let's try dividing by 4:
198,939,215 ÷ 4 = 49,734,803.75
If the quotient is a whole number, then 4 and 49,734,803.75 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 | 198,939,215 | |
| -1 | 198,939,215 |
If you did it right, you will end up with this table:
| 1 | 5 | 19 | 95 | 107 | 535 | 2,033 | 10,165 | 19,571 | 97,855 | 371,849 | 1,859,245 | 2,094,097 | 10,470,485 | 39,787,843 | 198,939,215 |
| -1 | -5 | -19 | -95 | -107 | -535 | -2,033 | -10,165 | -19,571 | -97,855 | -371,849 | -1,859,245 | -2,094,097 | -10,470,485 | -39,787,843 | -198,939,215 |
Here are some more numbers to try:
Try the factor calculator