A:
Positive:
1 x 2153606155 x 4307212323 x 9363505115 x 1872701821 x 2623152281 x 944154105 x 5246311405 x 18883
Negative:
-1 x -215360615-5 x -43072123-23 x -9363505-115 x -1872701-821 x -262315-2281 x -94415-4105 x -52463-11405 x -18883
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 215,360,615, 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 | 215,360,615 | |
| -1 | -215,360,615 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 215,360,615.
Example:
1 x 215,360,615 = 215,360,615
and
-1 x -215,360,615 = 215,360,615
Notice both answers equal 215,360,615
With that explanation out of the way, let's continue. Next, we take the number 215,360,615 and divide it by 2:
215,360,615 ÷ 2 = 107,680,307.5
If the quotient is a whole number, then 2 and 107,680,307.5 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 | 215,360,615 | |
| -1 | -215,360,615 |
Now, we try dividing 215,360,615 by 3:
215,360,615 ÷ 3 = 71,786,871.6667
If the quotient is a whole number, then 3 and 71,786,871.6667 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 | 215,360,615 | |
| -1 | -215,360,615 |
Let's try dividing by 4:
215,360,615 ÷ 4 = 53,840,153.75
If the quotient is a whole number, then 4 and 53,840,153.75 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 | 215,360,615 | |
| -1 | 215,360,615 |
If you did it right, you will end up with this table:
| 1 | 5 | 23 | 115 | 821 | 2,281 | 4,105 | 11,405 | 18,883 | 52,463 | 94,415 | 262,315 | 1,872,701 | 9,363,505 | 43,072,123 | 215,360,615 |
| -1 | -5 | -23 | -115 | -821 | -2,281 | -4,105 | -11,405 | -18,883 | -52,463 | -94,415 | -262,315 | -1,872,701 | -9,363,505 | -43,072,123 | -215,360,615 |
Here are some more numbers to try:
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