A:
Positive:
1 x 120015055 x 240030129 x 41384537 x 324365145 x 82769185 x 648731073 x 111852237 x 5365
Negative:
-1 x -12001505-5 x -2400301-29 x -413845-37 x -324365-145 x -82769-185 x -64873-1073 x -11185-2237 x -5365
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 12,001,505, 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 | 12,001,505 | |
| -1 | -12,001,505 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 12,001,505.
Example:
1 x 12,001,505 = 12,001,505
and
-1 x -12,001,505 = 12,001,505
Notice both answers equal 12,001,505
With that explanation out of the way, let's continue. Next, we take the number 12,001,505 and divide it by 2:
12,001,505 ÷ 2 = 6,000,752.5
If the quotient is a whole number, then 2 and 6,000,752.5 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 | 12,001,505 | |
| -1 | -12,001,505 |
Now, we try dividing 12,001,505 by 3:
12,001,505 ÷ 3 = 4,000,501.6667
If the quotient is a whole number, then 3 and 4,000,501.6667 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 | 12,001,505 | |
| -1 | -12,001,505 |
Let's try dividing by 4:
12,001,505 ÷ 4 = 3,000,376.25
If the quotient is a whole number, then 4 and 3,000,376.25 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 | 12,001,505 | |
| -1 | 12,001,505 |
If you did it right, you will end up with this table:
| 1 | 5 | 29 | 37 | 145 | 185 | 1,073 | 2,237 | 5,365 | 11,185 | 64,873 | 82,769 | 324,365 | 413,845 | 2,400,301 | 12,001,505 |
| -1 | -5 | -29 | -37 | -145 | -185 | -1,073 | -2,237 | -5,365 | -11,185 | -64,873 | -82,769 | -324,365 | -413,845 | -2,400,301 | -12,001,505 |
Here are some more numbers to try:
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