A:
Positive:
1 x 2125006555 x 4250013119 x 1118424595 x 2236849163 x 1303685815 x 2607373097 x 6861513723 x 15485
Negative:
-1 x -212500655-5 x -42500131-19 x -11184245-95 x -2236849-163 x -1303685-815 x -260737-3097 x -68615-13723 x -15485
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 212,500,655, 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 | 212,500,655 | |
| -1 | -212,500,655 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 212,500,655.
Example:
1 x 212,500,655 = 212,500,655
and
-1 x -212,500,655 = 212,500,655
Notice both answers equal 212,500,655
With that explanation out of the way, let's continue. Next, we take the number 212,500,655 and divide it by 2:
212,500,655 ÷ 2 = 106,250,327.5
If the quotient is a whole number, then 2 and 106,250,327.5 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 | 212,500,655 | |
| -1 | -212,500,655 |
Now, we try dividing 212,500,655 by 3:
212,500,655 ÷ 3 = 70,833,551.6667
If the quotient is a whole number, then 3 and 70,833,551.6667 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 | 212,500,655 | |
| -1 | -212,500,655 |
Let's try dividing by 4:
212,500,655 ÷ 4 = 53,125,163.75
If the quotient is a whole number, then 4 and 53,125,163.75 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 | 212,500,655 | |
| -1 | 212,500,655 |
If you did it right, you will end up with this table:
| 1 | 5 | 19 | 95 | 163 | 815 | 3,097 | 13,723 | 15,485 | 68,615 | 260,737 | 1,303,685 | 2,236,849 | 11,184,245 | 42,500,131 | 212,500,655 |
| -1 | -5 | -19 | -95 | -163 | -815 | -3,097 | -13,723 | -15,485 | -68,615 | -260,737 | -1,303,685 | -2,236,849 | -11,184,245 | -42,500,131 | -212,500,655 |
Here are some more numbers to try:
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