A:
Positive:
1 x 38712010711 x 3519273717 x 2277177123 x 16831309187 x 2070161253 x 1530119391 x 9900774301 x 90007
Negative:
-1 x -387120107-11 x -35192737-17 x -22771771-23 x -16831309-187 x -2070161-253 x -1530119-391 x -990077-4301 x -90007
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 387,120,107, 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 | 387,120,107 | |
| -1 | -387,120,107 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 387,120,107.
Example:
1 x 387,120,107 = 387,120,107
and
-1 x -387,120,107 = 387,120,107
Notice both answers equal 387,120,107
With that explanation out of the way, let's continue. Next, we take the number 387,120,107 and divide it by 2:
387,120,107 ÷ 2 = 193,560,053.5
If the quotient is a whole number, then 2 and 193,560,053.5 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 | 387,120,107 | |
| -1 | -387,120,107 |
Now, we try dividing 387,120,107 by 3:
387,120,107 ÷ 3 = 129,040,035.6667
If the quotient is a whole number, then 3 and 129,040,035.6667 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 | 387,120,107 | |
| -1 | -387,120,107 |
Let's try dividing by 4:
387,120,107 ÷ 4 = 96,780,026.75
If the quotient is a whole number, then 4 and 96,780,026.75 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 | 387,120,107 | |
| -1 | 387,120,107 |
If you did it right, you will end up with this table:
| 1 | 11 | 17 | 23 | 187 | 253 | 391 | 4,301 | 90,007 | 990,077 | 1,530,119 | 2,070,161 | 16,831,309 | 22,771,771 | 35,192,737 | 387,120,107 |
| -1 | -11 | -17 | -23 | -187 | -253 | -391 | -4,301 | -90,007 | -990,077 | -1,530,119 | -2,070,161 | -16,831,309 | -22,771,771 | -35,192,737 | -387,120,107 |
Here are some more numbers to try:
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