A:
Positive:
1 x 2100001155 x 4200002313 x 1615385565 x 3230771179 x 1173185895 x 2346372327 x 9024511635 x 18049
Negative:
-1 x -210000115-5 x -42000023-13 x -16153855-65 x -3230771-179 x -1173185-895 x -234637-2327 x -90245-11635 x -18049
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 210,000,115, 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 | 210,000,115 | |
| -1 | -210,000,115 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 210,000,115.
Example:
1 x 210,000,115 = 210,000,115
and
-1 x -210,000,115 = 210,000,115
Notice both answers equal 210,000,115
With that explanation out of the way, let's continue. Next, we take the number 210,000,115 and divide it by 2:
210,000,115 ÷ 2 = 105,000,057.5
If the quotient is a whole number, then 2 and 105,000,057.5 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 | 210,000,115 | |
| -1 | -210,000,115 |
Now, we try dividing 210,000,115 by 3:
210,000,115 ÷ 3 = 70,000,038.3333
If the quotient is a whole number, then 3 and 70,000,038.3333 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 | 210,000,115 | |
| -1 | -210,000,115 |
Let's try dividing by 4:
210,000,115 ÷ 4 = 52,500,028.75
If the quotient is a whole number, then 4 and 52,500,028.75 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 | 210,000,115 | |
| -1 | 210,000,115 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 65 | 179 | 895 | 2,327 | 11,635 | 18,049 | 90,245 | 234,637 | 1,173,185 | 3,230,771 | 16,153,855 | 42,000,023 | 210,000,115 |
| -1 | -5 | -13 | -65 | -179 | -895 | -2,327 | -11,635 | -18,049 | -90,245 | -234,637 | -1,173,185 | -3,230,771 | -16,153,855 | -42,000,023 | -210,000,115 |
Here are some more numbers to try:
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