A:
Positive:
1 x 1204051877 x 1720074129 x 4151903203 x 593129449 x 2681631321 x 911473143 x 383099247 x 13021
Negative:
-1 x -120405187-7 x -17200741-29 x -4151903-203 x -593129-449 x -268163-1321 x -91147-3143 x -38309-9247 x -13021
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 120,405,187, 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 | 120,405,187 | |
| -1 | -120,405,187 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 120,405,187.
Example:
1 x 120,405,187 = 120,405,187
and
-1 x -120,405,187 = 120,405,187
Notice both answers equal 120,405,187
With that explanation out of the way, let's continue. Next, we take the number 120,405,187 and divide it by 2:
120,405,187 ÷ 2 = 60,202,593.5
If the quotient is a whole number, then 2 and 60,202,593.5 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 | 120,405,187 | |
| -1 | -120,405,187 |
Now, we try dividing 120,405,187 by 3:
120,405,187 ÷ 3 = 40,135,062.3333
If the quotient is a whole number, then 3 and 40,135,062.3333 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 | 120,405,187 | |
| -1 | -120,405,187 |
Let's try dividing by 4:
120,405,187 ÷ 4 = 30,101,296.75
If the quotient is a whole number, then 4 and 30,101,296.75 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 | 120,405,187 | |
| -1 | 120,405,187 |
If you did it right, you will end up with this table:
| 1 | 7 | 29 | 203 | 449 | 1,321 | 3,143 | 9,247 | 13,021 | 38,309 | 91,147 | 268,163 | 593,129 | 4,151,903 | 17,200,741 | 120,405,187 |
| -1 | -7 | -29 | -203 | -449 | -1,321 | -3,143 | -9,247 | -13,021 | -38,309 | -91,147 | -268,163 | -593,129 | -4,151,903 | -17,200,741 | -120,405,187 |
Here are some more numbers to try:
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