A:
Positive:
1 x 250712155 x 501424313 x 192855565 x 385711181 x 138515905 x 277032131 x 117652353 x 10655
Negative:
-1 x -25071215-5 x -5014243-13 x -1928555-65 x -385711-181 x -138515-905 x -27703-2131 x -11765-2353 x -10655
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 25,071,215, 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 | 25,071,215 | |
| -1 | -25,071,215 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 25,071,215.
Example:
1 x 25,071,215 = 25,071,215
and
-1 x -25,071,215 = 25,071,215
Notice both answers equal 25,071,215
With that explanation out of the way, let's continue. Next, we take the number 25,071,215 and divide it by 2:
25,071,215 ÷ 2 = 12,535,607.5
If the quotient is a whole number, then 2 and 12,535,607.5 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 | 25,071,215 | |
| -1 | -25,071,215 |
Now, we try dividing 25,071,215 by 3:
25,071,215 ÷ 3 = 8,357,071.6667
If the quotient is a whole number, then 3 and 8,357,071.6667 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 | 25,071,215 | |
| -1 | -25,071,215 |
Let's try dividing by 4:
25,071,215 ÷ 4 = 6,267,803.75
If the quotient is a whole number, then 4 and 6,267,803.75 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 | 25,071,215 | |
| -1 | 25,071,215 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 65 | 181 | 905 | 2,131 | 2,353 | 10,655 | 11,765 | 27,703 | 138,515 | 385,711 | 1,928,555 | 5,014,243 | 25,071,215 |
| -1 | -5 | -13 | -65 | -181 | -905 | -2,131 | -2,353 | -10,655 | -11,765 | -27,703 | -138,515 | -385,711 | -1,928,555 | -5,014,243 | -25,071,215 |
Here are some more numbers to try:
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