A:
Positive:
1 x 1289018913 x 99155319 x 67843123 x 560443247 x 52187299 x 43111437 x 294972269 x 5681
Negative:
-1 x -12890189-13 x -991553-19 x -678431-23 x -560443-247 x -52187-299 x -43111-437 x -29497-2269 x -5681
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 12,890,189, 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 | 12,890,189 | |
| -1 | -12,890,189 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 12,890,189.
Example:
1 x 12,890,189 = 12,890,189
and
-1 x -12,890,189 = 12,890,189
Notice both answers equal 12,890,189
With that explanation out of the way, let's continue. Next, we take the number 12,890,189 and divide it by 2:
12,890,189 ÷ 2 = 6,445,094.5
If the quotient is a whole number, then 2 and 6,445,094.5 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 | 12,890,189 | |
| -1 | -12,890,189 |
Now, we try dividing 12,890,189 by 3:
12,890,189 ÷ 3 = 4,296,729.6667
If the quotient is a whole number, then 3 and 4,296,729.6667 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 | 12,890,189 | |
| -1 | -12,890,189 |
Let's try dividing by 4:
12,890,189 ÷ 4 = 3,222,547.25
If the quotient is a whole number, then 4 and 3,222,547.25 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 | 12,890,189 | |
| -1 | 12,890,189 |
If you did it right, you will end up with this table:
| 1 | 13 | 19 | 23 | 247 | 299 | 437 | 2,269 | 5,681 | 29,497 | 43,111 | 52,187 | 560,443 | 678,431 | 991,553 | 12,890,189 |
| -1 | -13 | -19 | -23 | -247 | -299 | -437 | -2,269 | -5,681 | -29,497 | -43,111 | -52,187 | -560,443 | -678,431 | -991,553 | -12,890,189 |
Here are some more numbers to try:
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