A:
Positive:
1 x 153215155 x 306430311 x 139286537 x 41409555 x 278573185 x 82819407 x 376452035 x 7529
Negative:
-1 x -15321515-5 x -3064303-11 x -1392865-37 x -414095-55 x -278573-185 x -82819-407 x -37645-2035 x -7529
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 15,321,515, 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 | 15,321,515 | |
| -1 | -15,321,515 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 15,321,515.
Example:
1 x 15,321,515 = 15,321,515
and
-1 x -15,321,515 = 15,321,515
Notice both answers equal 15,321,515
With that explanation out of the way, let's continue. Next, we take the number 15,321,515 and divide it by 2:
15,321,515 ÷ 2 = 7,660,757.5
If the quotient is a whole number, then 2 and 7,660,757.5 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 | 15,321,515 | |
| -1 | -15,321,515 |
Now, we try dividing 15,321,515 by 3:
15,321,515 ÷ 3 = 5,107,171.6667
If the quotient is a whole number, then 3 and 5,107,171.6667 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 | 15,321,515 | |
| -1 | -15,321,515 |
Let's try dividing by 4:
15,321,515 ÷ 4 = 3,830,378.75
If the quotient is a whole number, then 4 and 3,830,378.75 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 | 15,321,515 | |
| -1 | 15,321,515 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 37 | 55 | 185 | 407 | 2,035 | 7,529 | 37,645 | 82,819 | 278,573 | 414,095 | 1,392,865 | 3,064,303 | 15,321,515 |
| -1 | -5 | -11 | -37 | -55 | -185 | -407 | -2,035 | -7,529 | -37,645 | -82,819 | -278,573 | -414,095 | -1,392,865 | -3,064,303 | -15,321,515 |
Here are some more numbers to try:
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