A:
Positive:
1 x 4080123855 x 8160247711 x 3709203555 x 7418407157 x 2598805785 x 5197611727 x 2362558635 x 47251
Negative:
-1 x -408012385-5 x -81602477-11 x -37092035-55 x -7418407-157 x -2598805-785 x -519761-1727 x -236255-8635 x -47251
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 408,012,385, 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 | 408,012,385 | |
| -1 | -408,012,385 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 408,012,385.
Example:
1 x 408,012,385 = 408,012,385
and
-1 x -408,012,385 = 408,012,385
Notice both answers equal 408,012,385
With that explanation out of the way, let's continue. Next, we take the number 408,012,385 and divide it by 2:
408,012,385 ÷ 2 = 204,006,192.5
If the quotient is a whole number, then 2 and 204,006,192.5 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 | 408,012,385 | |
| -1 | -408,012,385 |
Now, we try dividing 408,012,385 by 3:
408,012,385 ÷ 3 = 136,004,128.3333
If the quotient is a whole number, then 3 and 136,004,128.3333 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 | 408,012,385 | |
| -1 | -408,012,385 |
Let's try dividing by 4:
408,012,385 ÷ 4 = 102,003,096.25
If the quotient is a whole number, then 4 and 102,003,096.25 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 | 408,012,385 | |
| -1 | 408,012,385 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 157 | 785 | 1,727 | 8,635 | 47,251 | 236,255 | 519,761 | 2,598,805 | 7,418,407 | 37,092,035 | 81,602,477 | 408,012,385 |
| -1 | -5 | -11 | -55 | -157 | -785 | -1,727 | -8,635 | -47,251 | -236,255 | -519,761 | -2,598,805 | -7,418,407 | -37,092,035 | -81,602,477 | -408,012,385 |
Here are some more numbers to try:
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