A:
Positive:
1 x 308125855 x 616251717 x 181250519 x 162171585 x 36250195 x 324343323 x 953951615 x 19079
Negative:
-1 x -30812585-5 x -6162517-17 x -1812505-19 x -1621715-85 x -362501-95 x -324343-323 x -95395-1615 x -19079
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 30,812,585, 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 | 30,812,585 | |
| -1 | -30,812,585 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 30,812,585.
Example:
1 x 30,812,585 = 30,812,585
and
-1 x -30,812,585 = 30,812,585
Notice both answers equal 30,812,585
With that explanation out of the way, let's continue. Next, we take the number 30,812,585 and divide it by 2:
30,812,585 ÷ 2 = 15,406,292.5
If the quotient is a whole number, then 2 and 15,406,292.5 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 | 30,812,585 | |
| -1 | -30,812,585 |
Now, we try dividing 30,812,585 by 3:
30,812,585 ÷ 3 = 10,270,861.6667
If the quotient is a whole number, then 3 and 10,270,861.6667 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 | 30,812,585 | |
| -1 | -30,812,585 |
Let's try dividing by 4:
30,812,585 ÷ 4 = 7,703,146.25
If the quotient is a whole number, then 4 and 7,703,146.25 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 | 30,812,585 | |
| -1 | 30,812,585 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 19 | 85 | 95 | 323 | 1,615 | 19,079 | 95,395 | 324,343 | 362,501 | 1,621,715 | 1,812,505 | 6,162,517 | 30,812,585 |
| -1 | -5 | -17 | -19 | -85 | -95 | -323 | -1,615 | -19,079 | -95,395 | -324,343 | -362,501 | -1,621,715 | -1,812,505 | -6,162,517 | -30,812,585 |
Here are some more numbers to try:
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