A:
Positive:
1 x 130138197 x 185911713 x 100106383 x 15679391 x 143009581 x 223991079 x 120611723 x 7553
Negative:
-1 x -13013819-7 x -1859117-13 x -1001063-83 x -156793-91 x -143009-581 x -22399-1079 x -12061-1723 x -7553
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 13,013,819, 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 | 13,013,819 | |
| -1 | -13,013,819 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 13,013,819.
Example:
1 x 13,013,819 = 13,013,819
and
-1 x -13,013,819 = 13,013,819
Notice both answers equal 13,013,819
With that explanation out of the way, let's continue. Next, we take the number 13,013,819 and divide it by 2:
13,013,819 ÷ 2 = 6,506,909.5
If the quotient is a whole number, then 2 and 6,506,909.5 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 | 13,013,819 | |
| -1 | -13,013,819 |
Now, we try dividing 13,013,819 by 3:
13,013,819 ÷ 3 = 4,337,939.6667
If the quotient is a whole number, then 3 and 4,337,939.6667 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 | 13,013,819 | |
| -1 | -13,013,819 |
Let's try dividing by 4:
13,013,819 ÷ 4 = 3,253,454.75
If the quotient is a whole number, then 4 and 3,253,454.75 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 | 13,013,819 | |
| -1 | 13,013,819 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 83 | 91 | 581 | 1,079 | 1,723 | 7,553 | 12,061 | 22,399 | 143,009 | 156,793 | 1,001,063 | 1,859,117 | 13,013,819 |
| -1 | -7 | -13 | -83 | -91 | -581 | -1,079 | -1,723 | -7,553 | -12,061 | -22,399 | -143,009 | -156,793 | -1,001,063 | -1,859,117 | -13,013,819 |
Here are some more numbers to try:
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