A:
Positive:
1 x 9084020929 x 313242143 x 211256397 x 936497751 x 1209591247 x 728472813 x 322934171 x 21779
Negative:
-1 x -90840209-29 x -3132421-43 x -2112563-97 x -936497-751 x -120959-1247 x -72847-2813 x -32293-4171 x -21779
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 90,840,209, 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 | 90,840,209 | |
| -1 | -90,840,209 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 90,840,209.
Example:
1 x 90,840,209 = 90,840,209
and
-1 x -90,840,209 = 90,840,209
Notice both answers equal 90,840,209
With that explanation out of the way, let's continue. Next, we take the number 90,840,209 and divide it by 2:
90,840,209 ÷ 2 = 45,420,104.5
If the quotient is a whole number, then 2 and 45,420,104.5 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 | 90,840,209 | |
| -1 | -90,840,209 |
Now, we try dividing 90,840,209 by 3:
90,840,209 ÷ 3 = 30,280,069.6667
If the quotient is a whole number, then 3 and 30,280,069.6667 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 | 90,840,209 | |
| -1 | -90,840,209 |
Let's try dividing by 4:
90,840,209 ÷ 4 = 22,710,052.25
If the quotient is a whole number, then 4 and 22,710,052.25 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 | 90,840,209 | |
| -1 | 90,840,209 |
If you did it right, you will end up with this table:
| 1 | 29 | 43 | 97 | 751 | 1,247 | 2,813 | 4,171 | 21,779 | 32,293 | 72,847 | 120,959 | 936,497 | 2,112,563 | 3,132,421 | 90,840,209 |
| -1 | -29 | -43 | -97 | -751 | -1,247 | -2,813 | -4,171 | -21,779 | -32,293 | -72,847 | -120,959 | -936,497 | -2,112,563 | -3,132,421 | -90,840,209 |
Here are some more numbers to try:
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