A:
Positive:
1 x 308138397 x 440197719 x 1621781133 x 231683191 x 1613291213 x 254031337 x 230473629 x 8491
Negative:
-1 x -30813839-7 x -4401977-19 x -1621781-133 x -231683-191 x -161329-1213 x -25403-1337 x -23047-3629 x -8491
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 30,813,839, 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 | 30,813,839 | |
| -1 | -30,813,839 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 30,813,839.
Example:
1 x 30,813,839 = 30,813,839
and
-1 x -30,813,839 = 30,813,839
Notice both answers equal 30,813,839
With that explanation out of the way, let's continue. Next, we take the number 30,813,839 and divide it by 2:
30,813,839 ÷ 2 = 15,406,919.5
If the quotient is a whole number, then 2 and 15,406,919.5 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 | 30,813,839 | |
| -1 | -30,813,839 |
Now, we try dividing 30,813,839 by 3:
30,813,839 ÷ 3 = 10,271,279.6667
If the quotient is a whole number, then 3 and 10,271,279.6667 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 | 30,813,839 | |
| -1 | -30,813,839 |
Let's try dividing by 4:
30,813,839 ÷ 4 = 7,703,459.75
If the quotient is a whole number, then 4 and 7,703,459.75 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 | 30,813,839 | |
| -1 | 30,813,839 |
If you did it right, you will end up with this table:
| 1 | 7 | 19 | 133 | 191 | 1,213 | 1,337 | 3,629 | 8,491 | 23,047 | 25,403 | 161,329 | 231,683 | 1,621,781 | 4,401,977 | 30,813,839 |
| -1 | -7 | -19 | -133 | -191 | -1,213 | -1,337 | -3,629 | -8,491 | -23,047 | -25,403 | -161,329 | -231,683 | -1,621,781 | -4,401,977 | -30,813,839 |
Here are some more numbers to try:
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