A:
Positive:
1 x 1551211555 x 310242317 x 2216016535 x 443203371 x 2184805355 x 436961497 x 3121152485 x 62423
Negative:
-1 x -155121155-5 x -31024231-7 x -22160165-35 x -4432033-71 x -2184805-355 x -436961-497 x -312115-2485 x -62423
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 155,121,155, 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 | 155,121,155 | |
| -1 | -155,121,155 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 155,121,155.
Example:
1 x 155,121,155 = 155,121,155
and
-1 x -155,121,155 = 155,121,155
Notice both answers equal 155,121,155
With that explanation out of the way, let's continue. Next, we take the number 155,121,155 and divide it by 2:
155,121,155 ÷ 2 = 77,560,577.5
If the quotient is a whole number, then 2 and 77,560,577.5 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 | 155,121,155 | |
| -1 | -155,121,155 |
Now, we try dividing 155,121,155 by 3:
155,121,155 ÷ 3 = 51,707,051.6667
If the quotient is a whole number, then 3 and 51,707,051.6667 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 | 155,121,155 | |
| -1 | -155,121,155 |
Let's try dividing by 4:
155,121,155 ÷ 4 = 38,780,288.75
If the quotient is a whole number, then 4 and 38,780,288.75 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 | 155,121,155 | |
| -1 | 155,121,155 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 71 | 355 | 497 | 2,485 | 62,423 | 312,115 | 436,961 | 2,184,805 | 4,432,033 | 22,160,165 | 31,024,231 | 155,121,155 |
| -1 | -5 | -7 | -35 | -71 | -355 | -497 | -2,485 | -62,423 | -312,115 | -436,961 | -2,184,805 | -4,432,033 | -22,160,165 | -31,024,231 | -155,121,155 |
Here are some more numbers to try:
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