A:
Positive:
1 x 2512206655 x 5024413383 x 3026755131 x 1917715415 x 605351655 x 3835434621 x 5436510873 x 23105
Negative:
-1 x -251220665-5 x -50244133-83 x -3026755-131 x -1917715-415 x -605351-655 x -383543-4621 x -54365-10873 x -23105
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 251,220,665, 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 | 251,220,665 | |
| -1 | -251,220,665 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 251,220,665.
Example:
1 x 251,220,665 = 251,220,665
and
-1 x -251,220,665 = 251,220,665
Notice both answers equal 251,220,665
With that explanation out of the way, let's continue. Next, we take the number 251,220,665 and divide it by 2:
251,220,665 ÷ 2 = 125,610,332.5
If the quotient is a whole number, then 2 and 125,610,332.5 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 | 251,220,665 | |
| -1 | -251,220,665 |
Now, we try dividing 251,220,665 by 3:
251,220,665 ÷ 3 = 83,740,221.6667
If the quotient is a whole number, then 3 and 83,740,221.6667 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 | 251,220,665 | |
| -1 | -251,220,665 |
Let's try dividing by 4:
251,220,665 ÷ 4 = 62,805,166.25
If the quotient is a whole number, then 4 and 62,805,166.25 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 | 251,220,665 | |
| -1 | 251,220,665 |
If you did it right, you will end up with this table:
| 1 | 5 | 83 | 131 | 415 | 655 | 4,621 | 10,873 | 23,105 | 54,365 | 383,543 | 605,351 | 1,917,715 | 3,026,755 | 50,244,133 | 251,220,665 |
| -1 | -5 | -83 | -131 | -415 | -655 | -4,621 | -10,873 | -23,105 | -54,365 | -383,543 | -605,351 | -1,917,715 | -3,026,755 | -50,244,133 | -251,220,665 |
Here are some more numbers to try:
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