A:
Positive:
1 x 815642 x 407823 x 271884 x 203916 x 135947 x 1165212 x 679714 x 582621 x 388428 x 291342 x 194284 x 971
Negative:
-1 x -81564-2 x -40782-3 x -27188-4 x -20391-6 x -13594-7 x -11652-12 x -6797-14 x -5826-21 x -3884-28 x -2913-42 x -1942-84 x -971
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 81,564, 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 | 81,564 | |
| -1 | -81,564 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 81,564.
Example:
1 x 81,564 = 81,564
and
-1 x -81,564 = 81,564
Notice both answers equal 81,564
With that explanation out of the way, let's continue. Next, we take the number 81,564 and divide it by 2:
81,564 ÷ 2 = 40,782
If the quotient is a whole number, then 2 and 40,782 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!
Here is what our table should look like at this step:
| 1 | 2 | 40,782 | 81,564 | |
| -1 | -2 | -40,782 | -81,564 |
Now, we try dividing 81,564 by 3:
81,564 ÷ 3 = 27,188
If the quotient is a whole number, then 3 and 27,188 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!
Here is what our table should look like at this step:
| 1 | 2 | 3 | 27,188 | 40,782 | 81,564 | |
| -1 | -2 | -3 | -27,188 | -40,782 | -81,564 |
Let's try dividing by 4:
81,564 ÷ 4 = 20,391
If the quotient is a whole number, then 4 and 20,391 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!
Here is what our table should look like at this step:
| 1 | 2 | 3 | 4 | 20,391 | 27,188 | 40,782 | 81,564 | |
| -1 | -2 | -3 | -4 | -20,391 | -27,188 | -40,782 | 81,564 |
If you did it right, you will end up with this table:
| 1 | 2 | 3 | 4 | 6 | 7 | 12 | 14 | 21 | 28 | 42 | 84 | 971 | 1,942 | 2,913 | 3,884 | 5,826 | 6,797 | 11,652 | 13,594 | 20,391 | 27,188 | 40,782 | 81,564 |
| -1 | -2 | -3 | -4 | -6 | -7 | -12 | -14 | -21 | -28 | -42 | -84 | -971 | -1,942 | -2,913 | -3,884 | -5,826 | -6,797 | -11,652 | -13,594 | -20,391 | -27,188 | -40,782 | -81,564 |
Here are some more numbers to try:
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