A:
Positive:
1 x 1556019855 x 311203977 x 2222885511 x 1414563535 x 444577155 x 282912777 x 2020805385 x 404161
Negative:
-1 x -155601985-5 x -31120397-7 x -22228855-11 x -14145635-35 x -4445771-55 x -2829127-77 x -2020805-385 x -404161
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 155,601,985, 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 | 155,601,985 | |
| -1 | -155,601,985 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 155,601,985.
Example:
1 x 155,601,985 = 155,601,985
and
-1 x -155,601,985 = 155,601,985
Notice both answers equal 155,601,985
With that explanation out of the way, let's continue. Next, we take the number 155,601,985 and divide it by 2:
155,601,985 ÷ 2 = 77,800,992.5
If the quotient is a whole number, then 2 and 77,800,992.5 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 | 155,601,985 | |
| -1 | -155,601,985 |
Now, we try dividing 155,601,985 by 3:
155,601,985 ÷ 3 = 51,867,328.3333
If the quotient is a whole number, then 3 and 51,867,328.3333 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 | 155,601,985 | |
| -1 | -155,601,985 |
Let's try dividing by 4:
155,601,985 ÷ 4 = 38,900,496.25
If the quotient is a whole number, then 4 and 38,900,496.25 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 | 155,601,985 | |
| -1 | 155,601,985 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 11 | 35 | 55 | 77 | 385 | 404,161 | 2,020,805 | 2,829,127 | 4,445,771 | 14,145,635 | 22,228,855 | 31,120,397 | 155,601,985 |
| -1 | -5 | -7 | -11 | -35 | -55 | -77 | -385 | -404,161 | -2,020,805 | -2,829,127 | -4,445,771 | -14,145,635 | -22,228,855 | -31,120,397 | -155,601,985 |
Here are some more numbers to try:
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