A:
Positive:
1 x 3121511913 x 240116319 x 164290143 x 725933247 x 126377559 x 55841817 x 382072939 x 10621
Negative:
-1 x -31215119-13 x -2401163-19 x -1642901-43 x -725933-247 x -126377-559 x -55841-817 x -38207-2939 x -10621
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 31,215,119, 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 | 31,215,119 | |
| -1 | -31,215,119 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 31,215,119.
Example:
1 x 31,215,119 = 31,215,119
and
-1 x -31,215,119 = 31,215,119
Notice both answers equal 31,215,119
With that explanation out of the way, let's continue. Next, we take the number 31,215,119 and divide it by 2:
31,215,119 ÷ 2 = 15,607,559.5
If the quotient is a whole number, then 2 and 15,607,559.5 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 | 31,215,119 | |
| -1 | -31,215,119 |
Now, we try dividing 31,215,119 by 3:
31,215,119 ÷ 3 = 10,405,039.6667
If the quotient is a whole number, then 3 and 10,405,039.6667 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 | 31,215,119 | |
| -1 | -31,215,119 |
Let's try dividing by 4:
31,215,119 ÷ 4 = 7,803,779.75
If the quotient is a whole number, then 4 and 7,803,779.75 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 | 31,215,119 | |
| -1 | 31,215,119 |
If you did it right, you will end up with this table:
| 1 | 13 | 19 | 43 | 247 | 559 | 817 | 2,939 | 10,621 | 38,207 | 55,841 | 126,377 | 725,933 | 1,642,901 | 2,401,163 | 31,215,119 |
| -1 | -13 | -19 | -43 | -247 | -559 | -817 | -2,939 | -10,621 | -38,207 | -55,841 | -126,377 | -725,933 | -1,642,901 | -2,401,163 | -31,215,119 |
Here are some more numbers to try:
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