A:
Positive:
1 x 2123201155 x 424640237 x 3033144535 x 6066289691 x 3072653455 x 614534837 x 438958779 x 24185
Negative:
-1 x -212320115-5 x -42464023-7 x -30331445-35 x -6066289-691 x -307265-3455 x -61453-4837 x -43895-8779 x -24185
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 212,320,115, 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 | 212,320,115 | |
| -1 | -212,320,115 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 212,320,115.
Example:
1 x 212,320,115 = 212,320,115
and
-1 x -212,320,115 = 212,320,115
Notice both answers equal 212,320,115
With that explanation out of the way, let's continue. Next, we take the number 212,320,115 and divide it by 2:
212,320,115 ÷ 2 = 106,160,057.5
If the quotient is a whole number, then 2 and 106,160,057.5 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 | 212,320,115 | |
| -1 | -212,320,115 |
Now, we try dividing 212,320,115 by 3:
212,320,115 ÷ 3 = 70,773,371.6667
If the quotient is a whole number, then 3 and 70,773,371.6667 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 | 212,320,115 | |
| -1 | -212,320,115 |
Let's try dividing by 4:
212,320,115 ÷ 4 = 53,080,028.75
If the quotient is a whole number, then 4 and 53,080,028.75 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 | 212,320,115 | |
| -1 | 212,320,115 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 691 | 3,455 | 4,837 | 8,779 | 24,185 | 43,895 | 61,453 | 307,265 | 6,066,289 | 30,331,445 | 42,464,023 | 212,320,115 |
| -1 | -5 | -7 | -35 | -691 | -3,455 | -4,837 | -8,779 | -24,185 | -43,895 | -61,453 | -307,265 | -6,066,289 | -30,331,445 | -42,464,023 | -212,320,115 |
Here are some more numbers to try:
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