A:
Positive:
1 x 112132155 x 224264313 x 86255565 x 172511167 x 67145835 x 134291033 x 108552171 x 5165
Negative:
-1 x -11213215-5 x -2242643-13 x -862555-65 x -172511-167 x -67145-835 x -13429-1033 x -10855-2171 x -5165
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 11,213,215, 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 | 11,213,215 | |
| -1 | -11,213,215 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 11,213,215.
Example:
1 x 11,213,215 = 11,213,215
and
-1 x -11,213,215 = 11,213,215
Notice both answers equal 11,213,215
With that explanation out of the way, let's continue. Next, we take the number 11,213,215 and divide it by 2:
11,213,215 ÷ 2 = 5,606,607.5
If the quotient is a whole number, then 2 and 5,606,607.5 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 | 11,213,215 | |
| -1 | -11,213,215 |
Now, we try dividing 11,213,215 by 3:
11,213,215 ÷ 3 = 3,737,738.3333
If the quotient is a whole number, then 3 and 3,737,738.3333 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 | 11,213,215 | |
| -1 | -11,213,215 |
Let's try dividing by 4:
11,213,215 ÷ 4 = 2,803,303.75
If the quotient is a whole number, then 4 and 2,803,303.75 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 | 11,213,215 | |
| -1 | 11,213,215 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 65 | 167 | 835 | 1,033 | 2,171 | 5,165 | 10,855 | 13,429 | 67,145 | 172,511 | 862,555 | 2,242,643 | 11,213,215 |
| -1 | -5 | -13 | -65 | -167 | -835 | -1,033 | -2,171 | -5,165 | -10,855 | -13,429 | -67,145 | -172,511 | -862,555 | -2,242,643 | -11,213,215 |
Here are some more numbers to try:
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