A:
Positive:
1 x 1203489055 x 2406978147 x 256061571 x 1695055235 x 512123355 x 3390113337 x 360657213 x 16685
Negative:
-1 x -120348905-5 x -24069781-47 x -2560615-71 x -1695055-235 x -512123-355 x -339011-3337 x -36065-7213 x -16685
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 120,348,905, 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 | 120,348,905 | |
| -1 | -120,348,905 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 120,348,905.
Example:
1 x 120,348,905 = 120,348,905
and
-1 x -120,348,905 = 120,348,905
Notice both answers equal 120,348,905
With that explanation out of the way, let's continue. Next, we take the number 120,348,905 and divide it by 2:
120,348,905 ÷ 2 = 60,174,452.5
If the quotient is a whole number, then 2 and 60,174,452.5 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 | 120,348,905 | |
| -1 | -120,348,905 |
Now, we try dividing 120,348,905 by 3:
120,348,905 ÷ 3 = 40,116,301.6667
If the quotient is a whole number, then 3 and 40,116,301.6667 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 | 120,348,905 | |
| -1 | -120,348,905 |
Let's try dividing by 4:
120,348,905 ÷ 4 = 30,087,226.25
If the quotient is a whole number, then 4 and 30,087,226.25 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 | 120,348,905 | |
| -1 | 120,348,905 |
If you did it right, you will end up with this table:
| 1 | 5 | 47 | 71 | 235 | 355 | 3,337 | 7,213 | 16,685 | 36,065 | 339,011 | 512,123 | 1,695,055 | 2,560,615 | 24,069,781 | 120,348,905 |
| -1 | -5 | -47 | -71 | -235 | -355 | -3,337 | -7,213 | -16,685 | -36,065 | -339,011 | -512,123 | -1,695,055 | -2,560,615 | -24,069,781 | -120,348,905 |
Here are some more numbers to try:
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