A:
Positive:
1 x 4031242155 x 8062484313 x 3100955529 x 1390083565 x 6201911145 x 2780167377 x 10692951885 x 213859
Negative:
-1 x -403124215-5 x -80624843-13 x -31009555-29 x -13900835-65 x -6201911-145 x -2780167-377 x -1069295-1885 x -213859
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 403,124,215, 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 | 403,124,215 | |
| -1 | -403,124,215 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 403,124,215.
Example:
1 x 403,124,215 = 403,124,215
and
-1 x -403,124,215 = 403,124,215
Notice both answers equal 403,124,215
With that explanation out of the way, let's continue. Next, we take the number 403,124,215 and divide it by 2:
403,124,215 ÷ 2 = 201,562,107.5
If the quotient is a whole number, then 2 and 201,562,107.5 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 | 403,124,215 | |
| -1 | -403,124,215 |
Now, we try dividing 403,124,215 by 3:
403,124,215 ÷ 3 = 134,374,738.3333
If the quotient is a whole number, then 3 and 134,374,738.3333 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 | 403,124,215 | |
| -1 | -403,124,215 |
Let's try dividing by 4:
403,124,215 ÷ 4 = 100,781,053.75
If the quotient is a whole number, then 4 and 100,781,053.75 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 | 403,124,215 | |
| -1 | 403,124,215 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 29 | 65 | 145 | 377 | 1,885 | 213,859 | 1,069,295 | 2,780,167 | 6,201,911 | 13,900,835 | 31,009,555 | 80,624,843 | 403,124,215 |
| -1 | -5 | -13 | -29 | -65 | -145 | -377 | -1,885 | -213,859 | -1,069,295 | -2,780,167 | -6,201,911 | -13,900,835 | -31,009,555 | -80,624,843 | -403,124,215 |
Here are some more numbers to try:
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