A:
Positive:
1 x 312211855 x 624423731 x 100713571 x 439735155 x 201427355 x 879472201 x 141852837 x 11005
Negative:
-1 x -31221185-5 x -6244237-31 x -1007135-71 x -439735-155 x -201427-355 x -87947-2201 x -14185-2837 x -11005
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 31,221,185, 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 | 31,221,185 | |
| -1 | -31,221,185 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 31,221,185.
Example:
1 x 31,221,185 = 31,221,185
and
-1 x -31,221,185 = 31,221,185
Notice both answers equal 31,221,185
With that explanation out of the way, let's continue. Next, we take the number 31,221,185 and divide it by 2:
31,221,185 ÷ 2 = 15,610,592.5
If the quotient is a whole number, then 2 and 15,610,592.5 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 | 31,221,185 | |
| -1 | -31,221,185 |
Now, we try dividing 31,221,185 by 3:
31,221,185 ÷ 3 = 10,407,061.6667
If the quotient is a whole number, then 3 and 10,407,061.6667 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 | 31,221,185 | |
| -1 | -31,221,185 |
Let's try dividing by 4:
31,221,185 ÷ 4 = 7,805,296.25
If the quotient is a whole number, then 4 and 7,805,296.25 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 | 31,221,185 | |
| -1 | 31,221,185 |
If you did it right, you will end up with this table:
| 1 | 5 | 31 | 71 | 155 | 355 | 2,201 | 2,837 | 11,005 | 14,185 | 87,947 | 201,427 | 439,735 | 1,007,135 | 6,244,237 | 31,221,185 |
| -1 | -5 | -31 | -71 | -155 | -355 | -2,201 | -2,837 | -11,005 | -14,185 | -87,947 | -201,427 | -439,735 | -1,007,135 | -6,244,237 | -31,221,185 |
Here are some more numbers to try:
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