A:
Positive:
1 x 219080755 x 43816157 x 312972523 x 95252525 x 87632335 x 625945115 x 190505161 x 136075175 x 125189575 x 38101805 x 272154025 x 5443
Negative:
-1 x -21908075-5 x -4381615-7 x -3129725-23 x -952525-25 x -876323-35 x -625945-115 x -190505-161 x -136075-175 x -125189-575 x -38101-805 x -27215-4025 x -5443
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 21,908,075, 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 | 21,908,075 | |
| -1 | -21,908,075 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,908,075.
Example:
1 x 21,908,075 = 21,908,075
and
-1 x -21,908,075 = 21,908,075
Notice both answers equal 21,908,075
With that explanation out of the way, let's continue. Next, we take the number 21,908,075 and divide it by 2:
21,908,075 ÷ 2 = 10,954,037.5
If the quotient is a whole number, then 2 and 10,954,037.5 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 | 21,908,075 | |
| -1 | -21,908,075 |
Now, we try dividing 21,908,075 by 3:
21,908,075 ÷ 3 = 7,302,691.6667
If the quotient is a whole number, then 3 and 7,302,691.6667 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 | 21,908,075 | |
| -1 | -21,908,075 |
Let's try dividing by 4:
21,908,075 ÷ 4 = 5,477,018.75
If the quotient is a whole number, then 4 and 5,477,018.75 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 | 21,908,075 | |
| -1 | 21,908,075 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 23 | 25 | 35 | 115 | 161 | 175 | 575 | 805 | 4,025 | 5,443 | 27,215 | 38,101 | 125,189 | 136,075 | 190,505 | 625,945 | 876,323 | 952,525 | 3,129,725 | 4,381,615 | 21,908,075 |
| -1 | -5 | -7 | -23 | -25 | -35 | -115 | -161 | -175 | -575 | -805 | -4,025 | -5,443 | -27,215 | -38,101 | -125,189 | -136,075 | -190,505 | -625,945 | -876,323 | -952,525 | -3,129,725 | -4,381,615 | -21,908,075 |
Here are some more numbers to try:
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