A:
Positive:
1 x 872031055 x 1744062111 x 792755541 x 212690555 x 1585511205 x 425381451 x 1933552255 x 38671
Negative:
-1 x -87203105-5 x -17440621-11 x -7927555-41 x -2126905-55 x -1585511-205 x -425381-451 x -193355-2255 x -38671
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 87,203,105, 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 | 87,203,105 | |
| -1 | -87,203,105 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 87,203,105.
Example:
1 x 87,203,105 = 87,203,105
and
-1 x -87,203,105 = 87,203,105
Notice both answers equal 87,203,105
With that explanation out of the way, let's continue. Next, we take the number 87,203,105 and divide it by 2:
87,203,105 ÷ 2 = 43,601,552.5
If the quotient is a whole number, then 2 and 43,601,552.5 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 | 87,203,105 | |
| -1 | -87,203,105 |
Now, we try dividing 87,203,105 by 3:
87,203,105 ÷ 3 = 29,067,701.6667
If the quotient is a whole number, then 3 and 29,067,701.6667 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 | 87,203,105 | |
| -1 | -87,203,105 |
Let's try dividing by 4:
87,203,105 ÷ 4 = 21,800,776.25
If the quotient is a whole number, then 4 and 21,800,776.25 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 | 87,203,105 | |
| -1 | 87,203,105 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 41 | 55 | 205 | 451 | 2,255 | 38,671 | 193,355 | 425,381 | 1,585,511 | 2,126,905 | 7,927,555 | 17,440,621 | 87,203,105 |
| -1 | -5 | -11 | -41 | -55 | -205 | -451 | -2,255 | -38,671 | -193,355 | -425,381 | -1,585,511 | -2,126,905 | -7,927,555 | -17,440,621 | -87,203,105 |
Here are some more numbers to try:
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