A:
Positive:
1 x 812110255 x 162422057 x 1160157525 x 324844135 x 2320315175 x 464063223 x 3641751115 x 728351561 x 520252081 x 390255575 x 145677805 x 10405
Negative:
-1 x -81211025-5 x -16242205-7 x -11601575-25 x -3248441-35 x -2320315-175 x -464063-223 x -364175-1115 x -72835-1561 x -52025-2081 x -39025-5575 x -14567-7805 x -10405
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 81,211,025, 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 | 81,211,025 | |
| -1 | -81,211,025 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 81,211,025.
Example:
1 x 81,211,025 = 81,211,025
and
-1 x -81,211,025 = 81,211,025
Notice both answers equal 81,211,025
With that explanation out of the way, let's continue. Next, we take the number 81,211,025 and divide it by 2:
81,211,025 ÷ 2 = 40,605,512.5
If the quotient is a whole number, then 2 and 40,605,512.5 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 | 81,211,025 | |
| -1 | -81,211,025 |
Now, we try dividing 81,211,025 by 3:
81,211,025 ÷ 3 = 27,070,341.6667
If the quotient is a whole number, then 3 and 27,070,341.6667 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 | 81,211,025 | |
| -1 | -81,211,025 |
Let's try dividing by 4:
81,211,025 ÷ 4 = 20,302,756.25
If the quotient is a whole number, then 4 and 20,302,756.25 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 | 81,211,025 | |
| -1 | 81,211,025 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 25 | 35 | 175 | 223 | 1,115 | 1,561 | 2,081 | 5,575 | 7,805 | 10,405 | 14,567 | 39,025 | 52,025 | 72,835 | 364,175 | 464,063 | 2,320,315 | 3,248,441 | 11,601,575 | 16,242,205 | 81,211,025 |
| -1 | -5 | -7 | -25 | -35 | -175 | -223 | -1,115 | -1,561 | -2,081 | -5,575 | -7,805 | -10,405 | -14,567 | -39,025 | -52,025 | -72,835 | -364,175 | -464,063 | -2,320,315 | -3,248,441 | -11,601,575 | -16,242,205 | -81,211,025 |
Here are some more numbers to try:
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