A:
Positive:
1 x 2151153417 x 3073076349 x 439010961 x 352648179 x 2722979427 x 503783553 x 388997911 x 2361312989 x 719693871 x 555714819 x 446396377 x 33733
Negative:
-1 x -215115341-7 x -30730763-49 x -4390109-61 x -3526481-79 x -2722979-427 x -503783-553 x -388997-911 x -236131-2989 x -71969-3871 x -55571-4819 x -44639-6377 x -33733
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 215,115,341, 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 | 215,115,341 | |
| -1 | -215,115,341 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 215,115,341.
Example:
1 x 215,115,341 = 215,115,341
and
-1 x -215,115,341 = 215,115,341
Notice both answers equal 215,115,341
With that explanation out of the way, let's continue. Next, we take the number 215,115,341 and divide it by 2:
215,115,341 ÷ 2 = 107,557,670.5
If the quotient is a whole number, then 2 and 107,557,670.5 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 | 215,115,341 | |
| -1 | -215,115,341 |
Now, we try dividing 215,115,341 by 3:
215,115,341 ÷ 3 = 71,705,113.6667
If the quotient is a whole number, then 3 and 71,705,113.6667 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 | 215,115,341 | |
| -1 | -215,115,341 |
Let's try dividing by 4:
215,115,341 ÷ 4 = 53,778,835.25
If the quotient is a whole number, then 4 and 53,778,835.25 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 | 215,115,341 | |
| -1 | 215,115,341 |
If you did it right, you will end up with this table:
| 1 | 7 | 49 | 61 | 79 | 427 | 553 | 911 | 2,989 | 3,871 | 4,819 | 6,377 | 33,733 | 44,639 | 55,571 | 71,969 | 236,131 | 388,997 | 503,783 | 2,722,979 | 3,526,481 | 4,390,109 | 30,730,763 | 215,115,341 |
| -1 | -7 | -49 | -61 | -79 | -427 | -553 | -911 | -2,989 | -3,871 | -4,819 | -6,377 | -33,733 | -44,639 | -55,571 | -71,969 | -236,131 | -388,997 | -503,783 | -2,722,979 | -3,526,481 | -4,390,109 | -30,730,763 | -215,115,341 |
Here are some more numbers to try:
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