A:
Positive:
1 x 19896742161 x 326176167 x 296966389 x 2235589547 x 3637434087 x 486835429 x 366495963 x 33367
Negative:
-1 x -198967421-61 x -3261761-67 x -2969663-89 x -2235589-547 x -363743-4087 x -48683-5429 x -36649-5963 x -33367
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 198,967,421, 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 | 198,967,421 | |
| -1 | -198,967,421 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 198,967,421.
Example:
1 x 198,967,421 = 198,967,421
and
-1 x -198,967,421 = 198,967,421
Notice both answers equal 198,967,421
With that explanation out of the way, let's continue. Next, we take the number 198,967,421 and divide it by 2:
198,967,421 ÷ 2 = 99,483,710.5
If the quotient is a whole number, then 2 and 99,483,710.5 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 | 198,967,421 | |
| -1 | -198,967,421 |
Now, we try dividing 198,967,421 by 3:
198,967,421 ÷ 3 = 66,322,473.6667
If the quotient is a whole number, then 3 and 66,322,473.6667 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 | 198,967,421 | |
| -1 | -198,967,421 |
Let's try dividing by 4:
198,967,421 ÷ 4 = 49,741,855.25
If the quotient is a whole number, then 4 and 49,741,855.25 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 | 198,967,421 | |
| -1 | 198,967,421 |
If you did it right, you will end up with this table:
| 1 | 61 | 67 | 89 | 547 | 4,087 | 5,429 | 5,963 | 33,367 | 36,649 | 48,683 | 363,743 | 2,235,589 | 2,969,663 | 3,261,761 | 198,967,421 |
| -1 | -61 | -67 | -89 | -547 | -4,087 | -5,429 | -5,963 | -33,367 | -36,649 | -48,683 | -363,743 | -2,235,589 | -2,969,663 | -3,261,761 | -198,967,421 |
Here are some more numbers to try:
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