A:
Positive:
1 x 2155001037 x 3078572913 x 1657693191 x 2368133151 x 14271531057 x 2038791963 x 10978113741 x 15683
Negative:
-1 x -215500103-7 x -30785729-13 x -16576931-91 x -2368133-151 x -1427153-1057 x -203879-1963 x -109781-13741 x -15683
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 215,500,103, 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 | 215,500,103 | |
| -1 | -215,500,103 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 215,500,103.
Example:
1 x 215,500,103 = 215,500,103
and
-1 x -215,500,103 = 215,500,103
Notice both answers equal 215,500,103
With that explanation out of the way, let's continue. Next, we take the number 215,500,103 and divide it by 2:
215,500,103 ÷ 2 = 107,750,051.5
If the quotient is a whole number, then 2 and 107,750,051.5 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 | 215,500,103 | |
| -1 | -215,500,103 |
Now, we try dividing 215,500,103 by 3:
215,500,103 ÷ 3 = 71,833,367.6667
If the quotient is a whole number, then 3 and 71,833,367.6667 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 | 215,500,103 | |
| -1 | -215,500,103 |
Let's try dividing by 4:
215,500,103 ÷ 4 = 53,875,025.75
If the quotient is a whole number, then 4 and 53,875,025.75 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 | 215,500,103 | |
| -1 | 215,500,103 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 91 | 151 | 1,057 | 1,963 | 13,741 | 15,683 | 109,781 | 203,879 | 1,427,153 | 2,368,133 | 16,576,931 | 30,785,729 | 215,500,103 |
| -1 | -7 | -13 | -91 | -151 | -1,057 | -1,963 | -13,741 | -15,683 | -109,781 | -203,879 | -1,427,153 | -2,368,133 | -16,576,931 | -30,785,729 | -215,500,103 |
Here are some more numbers to try:
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