A:
Positive:
1 x 120012055 x 240024189 x 134845149 x 80545181 x 66305445 x 26969745 x 16109905 x 13261
Negative:
-1 x -12001205-5 x -2400241-89 x -134845-149 x -80545-181 x -66305-445 x -26969-745 x -16109-905 x -13261
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 12,001,205, 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 | 12,001,205 | |
| -1 | -12,001,205 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 12,001,205.
Example:
1 x 12,001,205 = 12,001,205
and
-1 x -12,001,205 = 12,001,205
Notice both answers equal 12,001,205
With that explanation out of the way, let's continue. Next, we take the number 12,001,205 and divide it by 2:
12,001,205 ÷ 2 = 6,000,602.5
If the quotient is a whole number, then 2 and 6,000,602.5 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 | 12,001,205 | |
| -1 | -12,001,205 |
Now, we try dividing 12,001,205 by 3:
12,001,205 ÷ 3 = 4,000,401.6667
If the quotient is a whole number, then 3 and 4,000,401.6667 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 | 12,001,205 | |
| -1 | -12,001,205 |
Let's try dividing by 4:
12,001,205 ÷ 4 = 3,000,301.25
If the quotient is a whole number, then 4 and 3,000,301.25 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 | 12,001,205 | |
| -1 | 12,001,205 |
If you did it right, you will end up with this table:
| 1 | 5 | 89 | 149 | 181 | 445 | 745 | 905 | 13,261 | 16,109 | 26,969 | 66,305 | 80,545 | 134,845 | 2,400,241 | 12,001,205 |
| -1 | -5 | -89 | -149 | -181 | -445 | -745 | -905 | -13,261 | -16,109 | -26,969 | -66,305 | -80,545 | -134,845 | -2,400,241 | -12,001,205 |
Here are some more numbers to try:
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