A:
Positive:
1 x 651155155 x 1302310389 x 731635131 x 497065445 x 146327655 x 994131117 x 582955585 x 11659
Negative:
-1 x -65115515-5 x -13023103-89 x -731635-131 x -497065-445 x -146327-655 x -99413-1117 x -58295-5585 x -11659
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 65,115,515, 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 | 65,115,515 | |
| -1 | -65,115,515 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 65,115,515.
Example:
1 x 65,115,515 = 65,115,515
and
-1 x -65,115,515 = 65,115,515
Notice both answers equal 65,115,515
With that explanation out of the way, let's continue. Next, we take the number 65,115,515 and divide it by 2:
65,115,515 ÷ 2 = 32,557,757.5
If the quotient is a whole number, then 2 and 32,557,757.5 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 | 65,115,515 | |
| -1 | -65,115,515 |
Now, we try dividing 65,115,515 by 3:
65,115,515 ÷ 3 = 21,705,171.6667
If the quotient is a whole number, then 3 and 21,705,171.6667 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 | 65,115,515 | |
| -1 | -65,115,515 |
Let's try dividing by 4:
65,115,515 ÷ 4 = 16,278,878.75
If the quotient is a whole number, then 4 and 16,278,878.75 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 | 65,115,515 | |
| -1 | 65,115,515 |
If you did it right, you will end up with this table:
| 1 | 5 | 89 | 131 | 445 | 655 | 1,117 | 5,585 | 11,659 | 58,295 | 99,413 | 146,327 | 497,065 | 731,635 | 13,023,103 | 65,115,515 |
| -1 | -5 | -89 | -131 | -445 | -655 | -1,117 | -5,585 | -11,659 | -58,295 | -99,413 | -146,327 | -497,065 | -731,635 | -13,023,103 | -65,115,515 |
Here are some more numbers to try:
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