A:
Positive:
1 x 120052155 x 240104331 x 38726573 x 164455155 x 77453365 x 328911061 x 113152263 x 5305
Negative:
-1 x -12005215-5 x -2401043-31 x -387265-73 x -164455-155 x -77453-365 x -32891-1061 x -11315-2263 x -5305
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 12,005,215, 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 | 12,005,215 | |
| -1 | -12,005,215 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 12,005,215.
Example:
1 x 12,005,215 = 12,005,215
and
-1 x -12,005,215 = 12,005,215
Notice both answers equal 12,005,215
With that explanation out of the way, let's continue. Next, we take the number 12,005,215 and divide it by 2:
12,005,215 ÷ 2 = 6,002,607.5
If the quotient is a whole number, then 2 and 6,002,607.5 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 | 12,005,215 | |
| -1 | -12,005,215 |
Now, we try dividing 12,005,215 by 3:
12,005,215 ÷ 3 = 4,001,738.3333
If the quotient is a whole number, then 3 and 4,001,738.3333 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 | 12,005,215 | |
| -1 | -12,005,215 |
Let's try dividing by 4:
12,005,215 ÷ 4 = 3,001,303.75
If the quotient is a whole number, then 4 and 3,001,303.75 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 | 12,005,215 | |
| -1 | 12,005,215 |
If you did it right, you will end up with this table:
| 1 | 5 | 31 | 73 | 155 | 365 | 1,061 | 2,263 | 5,305 | 11,315 | 32,891 | 77,453 | 164,455 | 387,265 | 2,401,043 | 12,005,215 |
| -1 | -5 | -31 | -73 | -155 | -365 | -1,061 | -2,263 | -5,305 | -11,315 | -32,891 | -77,453 | -164,455 | -387,265 | -2,401,043 | -12,005,215 |
Here are some more numbers to try:
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