A:
Positive:
1 x 1216235155 x 2432470313 x 935565565 x 1871131239 x 5088851195 x 1017773107 x 391457829 x 15535
Negative:
-1 x -121623515-5 x -24324703-13 x -9355655-65 x -1871131-239 x -508885-1195 x -101777-3107 x -39145-7829 x -15535
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 121,623,515, 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 | 121,623,515 | |
| -1 | -121,623,515 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 121,623,515.
Example:
1 x 121,623,515 = 121,623,515
and
-1 x -121,623,515 = 121,623,515
Notice both answers equal 121,623,515
With that explanation out of the way, let's continue. Next, we take the number 121,623,515 and divide it by 2:
121,623,515 ÷ 2 = 60,811,757.5
If the quotient is a whole number, then 2 and 60,811,757.5 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 | 121,623,515 | |
| -1 | -121,623,515 |
Now, we try dividing 121,623,515 by 3:
121,623,515 ÷ 3 = 40,541,171.6667
If the quotient is a whole number, then 3 and 40,541,171.6667 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 | 121,623,515 | |
| -1 | -121,623,515 |
Let's try dividing by 4:
121,623,515 ÷ 4 = 30,405,878.75
If the quotient is a whole number, then 4 and 30,405,878.75 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 | 121,623,515 | |
| -1 | 121,623,515 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 65 | 239 | 1,195 | 3,107 | 7,829 | 15,535 | 39,145 | 101,777 | 508,885 | 1,871,131 | 9,355,655 | 24,324,703 | 121,623,515 |
| -1 | -5 | -13 | -65 | -239 | -1,195 | -3,107 | -7,829 | -15,535 | -39,145 | -101,777 | -508,885 | -1,871,131 | -9,355,655 | -24,324,703 | -121,623,515 |
Here are some more numbers to try:
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