A:
Positive:
1 x 303909977 x 434157113 x 233776991 x 333967337 x 90181991 x 306672359 x 128834381 x 6937
Negative:
-1 x -30390997-7 x -4341571-13 x -2337769-91 x -333967-337 x -90181-991 x -30667-2359 x -12883-4381 x -6937
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 30,390,997, 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 | 30,390,997 | |
| -1 | -30,390,997 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 30,390,997.
Example:
1 x 30,390,997 = 30,390,997
and
-1 x -30,390,997 = 30,390,997
Notice both answers equal 30,390,997
With that explanation out of the way, let's continue. Next, we take the number 30,390,997 and divide it by 2:
30,390,997 ÷ 2 = 15,195,498.5
If the quotient is a whole number, then 2 and 15,195,498.5 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 | 30,390,997 | |
| -1 | -30,390,997 |
Now, we try dividing 30,390,997 by 3:
30,390,997 ÷ 3 = 10,130,332.3333
If the quotient is a whole number, then 3 and 10,130,332.3333 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 | 30,390,997 | |
| -1 | -30,390,997 |
Let's try dividing by 4:
30,390,997 ÷ 4 = 7,597,749.25
If the quotient is a whole number, then 4 and 7,597,749.25 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 | 30,390,997 | |
| -1 | 30,390,997 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 91 | 337 | 991 | 2,359 | 4,381 | 6,937 | 12,883 | 30,667 | 90,181 | 333,967 | 2,337,769 | 4,341,571 | 30,390,997 |
| -1 | -7 | -13 | -91 | -337 | -991 | -2,359 | -4,381 | -6,937 | -12,883 | -30,667 | -90,181 | -333,967 | -2,337,769 | -4,341,571 | -30,390,997 |
Here are some more numbers to try:
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