A:
Positive:
1 x 2515821113 x 193524771 x 35434197 x 259363281 x 89531923 x 272571261 x 199513653 x 6887
Negative:
-1 x -25158211-13 x -1935247-71 x -354341-97 x -259363-281 x -89531-923 x -27257-1261 x -19951-3653 x -6887
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 25,158,211, 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 | 25,158,211 | |
| -1 | -25,158,211 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 25,158,211.
Example:
1 x 25,158,211 = 25,158,211
and
-1 x -25,158,211 = 25,158,211
Notice both answers equal 25,158,211
With that explanation out of the way, let's continue. Next, we take the number 25,158,211 and divide it by 2:
25,158,211 ÷ 2 = 12,579,105.5
If the quotient is a whole number, then 2 and 12,579,105.5 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 | 25,158,211 | |
| -1 | -25,158,211 |
Now, we try dividing 25,158,211 by 3:
25,158,211 ÷ 3 = 8,386,070.3333
If the quotient is a whole number, then 3 and 8,386,070.3333 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 | 25,158,211 | |
| -1 | -25,158,211 |
Let's try dividing by 4:
25,158,211 ÷ 4 = 6,289,552.75
If the quotient is a whole number, then 4 and 6,289,552.75 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 | 25,158,211 | |
| -1 | 25,158,211 |
If you did it right, you will end up with this table:
| 1 | 13 | 71 | 97 | 281 | 923 | 1,261 | 3,653 | 6,887 | 19,951 | 27,257 | 89,531 | 259,363 | 354,341 | 1,935,247 | 25,158,211 |
| -1 | -13 | -71 | -97 | -281 | -923 | -1,261 | -3,653 | -6,887 | -19,951 | -27,257 | -89,531 | -259,363 | -354,341 | -1,935,247 | -25,158,211 |
Here are some more numbers to try:
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