A:
Positive:
1 x 2151541555 x 4303083143 x 5003585215 x 1000717421 x 5110552105 x 1022112377 x 9051511885 x 18103
Negative:
-1 x -215154155-5 x -43030831-43 x -5003585-215 x -1000717-421 x -511055-2105 x -102211-2377 x -90515-11885 x -18103
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 215,154,155, 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 | 215,154,155 | |
| -1 | -215,154,155 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 215,154,155.
Example:
1 x 215,154,155 = 215,154,155
and
-1 x -215,154,155 = 215,154,155
Notice both answers equal 215,154,155
With that explanation out of the way, let's continue. Next, we take the number 215,154,155 and divide it by 2:
215,154,155 ÷ 2 = 107,577,077.5
If the quotient is a whole number, then 2 and 107,577,077.5 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 | 215,154,155 | |
| -1 | -215,154,155 |
Now, we try dividing 215,154,155 by 3:
215,154,155 ÷ 3 = 71,718,051.6667
If the quotient is a whole number, then 3 and 71,718,051.6667 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 | 215,154,155 | |
| -1 | -215,154,155 |
Let's try dividing by 4:
215,154,155 ÷ 4 = 53,788,538.75
If the quotient is a whole number, then 4 and 53,788,538.75 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 | 215,154,155 | |
| -1 | 215,154,155 |
If you did it right, you will end up with this table:
| 1 | 5 | 43 | 215 | 421 | 2,105 | 2,377 | 11,885 | 18,103 | 90,515 | 102,211 | 511,055 | 1,000,717 | 5,003,585 | 43,030,831 | 215,154,155 |
| -1 | -5 | -43 | -215 | -421 | -2,105 | -2,377 | -11,885 | -18,103 | -90,515 | -102,211 | -511,055 | -1,000,717 | -5,003,585 | -43,030,831 | -215,154,155 |
Here are some more numbers to try:
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