A:
Positive:
1 x 1555915155 x 3111830341 x 3794915205 x 758983331 x 4700651655 x 940132293 x 6785511465 x 13571
Negative:
-1 x -155591515-5 x -31118303-41 x -3794915-205 x -758983-331 x -470065-1655 x -94013-2293 x -67855-11465 x -13571
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 155,591,515, 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 | 155,591,515 | |
| -1 | -155,591,515 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 155,591,515.
Example:
1 x 155,591,515 = 155,591,515
and
-1 x -155,591,515 = 155,591,515
Notice both answers equal 155,591,515
With that explanation out of the way, let's continue. Next, we take the number 155,591,515 and divide it by 2:
155,591,515 ÷ 2 = 77,795,757.5
If the quotient is a whole number, then 2 and 77,795,757.5 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 | 155,591,515 | |
| -1 | -155,591,515 |
Now, we try dividing 155,591,515 by 3:
155,591,515 ÷ 3 = 51,863,838.3333
If the quotient is a whole number, then 3 and 51,863,838.3333 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 | 155,591,515 | |
| -1 | -155,591,515 |
Let's try dividing by 4:
155,591,515 ÷ 4 = 38,897,878.75
If the quotient is a whole number, then 4 and 38,897,878.75 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 | 155,591,515 | |
| -1 | 155,591,515 |
If you did it right, you will end up with this table:
| 1 | 5 | 41 | 205 | 331 | 1,655 | 2,293 | 11,465 | 13,571 | 67,855 | 94,013 | 470,065 | 758,983 | 3,794,915 | 31,118,303 | 155,591,515 |
| -1 | -5 | -41 | -205 | -331 | -1,655 | -2,293 | -11,465 | -13,571 | -67,855 | -94,013 | -470,065 | -758,983 | -3,794,915 | -31,118,303 | -155,591,515 |
Here are some more numbers to try:
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