A:
Positive:
1 x 1202005155 x 2404010371 x 1692965355 x 338593547 x 219745619 x 1941852735 x 439493095 x 38837
Negative:
-1 x -120200515-5 x -24040103-71 x -1692965-355 x -338593-547 x -219745-619 x -194185-2735 x -43949-3095 x -38837
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 120,200,515, 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 | 120,200,515 | |
| -1 | -120,200,515 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 120,200,515.
Example:
1 x 120,200,515 = 120,200,515
and
-1 x -120,200,515 = 120,200,515
Notice both answers equal 120,200,515
With that explanation out of the way, let's continue. Next, we take the number 120,200,515 and divide it by 2:
120,200,515 ÷ 2 = 60,100,257.5
If the quotient is a whole number, then 2 and 60,100,257.5 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 | 120,200,515 | |
| -1 | -120,200,515 |
Now, we try dividing 120,200,515 by 3:
120,200,515 ÷ 3 = 40,066,838.3333
If the quotient is a whole number, then 3 and 40,066,838.3333 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 | 120,200,515 | |
| -1 | -120,200,515 |
Let's try dividing by 4:
120,200,515 ÷ 4 = 30,050,128.75
If the quotient is a whole number, then 4 and 30,050,128.75 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 | 120,200,515 | |
| -1 | 120,200,515 |
If you did it right, you will end up with this table:
| 1 | 5 | 71 | 355 | 547 | 619 | 2,735 | 3,095 | 38,837 | 43,949 | 194,185 | 219,745 | 338,593 | 1,692,965 | 24,040,103 | 120,200,515 |
| -1 | -5 | -71 | -355 | -547 | -619 | -2,735 | -3,095 | -38,837 | -43,949 | -194,185 | -219,745 | -338,593 | -1,692,965 | -24,040,103 | -120,200,515 |
Here are some more numbers to try:
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