A:
Positive:
1 x 12039639711 x 1094512717 x 708214183 x 1450559187 x 643831913 x 1318691411 x 853277757 x 15521
Negative:
-1 x -120396397-11 x -10945127-17 x -7082141-83 x -1450559-187 x -643831-913 x -131869-1411 x -85327-7757 x -15521
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 120,396,397, 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 | 120,396,397 | |
| -1 | -120,396,397 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 120,396,397.
Example:
1 x 120,396,397 = 120,396,397
and
-1 x -120,396,397 = 120,396,397
Notice both answers equal 120,396,397
With that explanation out of the way, let's continue. Next, we take the number 120,396,397 and divide it by 2:
120,396,397 ÷ 2 = 60,198,198.5
If the quotient is a whole number, then 2 and 60,198,198.5 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 | 120,396,397 | |
| -1 | -120,396,397 |
Now, we try dividing 120,396,397 by 3:
120,396,397 ÷ 3 = 40,132,132.3333
If the quotient is a whole number, then 3 and 40,132,132.3333 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 | 120,396,397 | |
| -1 | -120,396,397 |
Let's try dividing by 4:
120,396,397 ÷ 4 = 30,099,099.25
If the quotient is a whole number, then 4 and 30,099,099.25 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 | 120,396,397 | |
| -1 | 120,396,397 |
If you did it right, you will end up with this table:
| 1 | 11 | 17 | 83 | 187 | 913 | 1,411 | 7,757 | 15,521 | 85,327 | 131,869 | 643,831 | 1,450,559 | 7,082,141 | 10,945,127 | 120,396,397 |
| -1 | -11 | -17 | -83 | -187 | -913 | -1,411 | -7,757 | -15,521 | -85,327 | -131,869 | -643,831 | -1,450,559 | -7,082,141 | -10,945,127 | -120,396,397 |
Here are some more numbers to try:
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