A:
Positive:
1 x 2154046255 x 4308092525 x 8616185125 x 1723237211 x 10208751055 x 2041755275 x 408358167 x 26375
Negative:
-1 x -215404625-5 x -43080925-25 x -8616185-125 x -1723237-211 x -1020875-1055 x -204175-5275 x -40835-8167 x -26375
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 215,404,625, 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 | 215,404,625 | |
| -1 | -215,404,625 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 215,404,625.
Example:
1 x 215,404,625 = 215,404,625
and
-1 x -215,404,625 = 215,404,625
Notice both answers equal 215,404,625
With that explanation out of the way, let's continue. Next, we take the number 215,404,625 and divide it by 2:
215,404,625 ÷ 2 = 107,702,312.5
If the quotient is a whole number, then 2 and 107,702,312.5 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 | 215,404,625 | |
| -1 | -215,404,625 |
Now, we try dividing 215,404,625 by 3:
215,404,625 ÷ 3 = 71,801,541.6667
If the quotient is a whole number, then 3 and 71,801,541.6667 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 | 215,404,625 | |
| -1 | -215,404,625 |
Let's try dividing by 4:
215,404,625 ÷ 4 = 53,851,156.25
If the quotient is a whole number, then 4 and 53,851,156.25 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 | 215,404,625 | |
| -1 | 215,404,625 |
If you did it right, you will end up with this table:
| 1 | 5 | 25 | 125 | 211 | 1,055 | 5,275 | 8,167 | 26,375 | 40,835 | 204,175 | 1,020,875 | 1,723,237 | 8,616,185 | 43,080,925 | 215,404,625 |
| -1 | -5 | -25 | -125 | -211 | -1,055 | -5,275 | -8,167 | -26,375 | -40,835 | -204,175 | -1,020,875 | -1,723,237 | -8,616,185 | -43,080,925 | -215,404,625 |
Here are some more numbers to try:
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