A:
Positive:
1 x 1277205055 x 2554410111 x 1161095555 x 2322191401 x 3185052005 x 637014411 x 289555791 x 22055
Negative:
-1 x -127720505-5 x -25544101-11 x -11610955-55 x -2322191-401 x -318505-2005 x -63701-4411 x -28955-5791 x -22055
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 127,720,505, 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 | 127,720,505 | |
| -1 | -127,720,505 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 127,720,505.
Example:
1 x 127,720,505 = 127,720,505
and
-1 x -127,720,505 = 127,720,505
Notice both answers equal 127,720,505
With that explanation out of the way, let's continue. Next, we take the number 127,720,505 and divide it by 2:
127,720,505 ÷ 2 = 63,860,252.5
If the quotient is a whole number, then 2 and 63,860,252.5 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 | 127,720,505 | |
| -1 | -127,720,505 |
Now, we try dividing 127,720,505 by 3:
127,720,505 ÷ 3 = 42,573,501.6667
If the quotient is a whole number, then 3 and 42,573,501.6667 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 | 127,720,505 | |
| -1 | -127,720,505 |
Let's try dividing by 4:
127,720,505 ÷ 4 = 31,930,126.25
If the quotient is a whole number, then 4 and 31,930,126.25 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 | 127,720,505 | |
| -1 | 127,720,505 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 401 | 2,005 | 4,411 | 5,791 | 22,055 | 28,955 | 63,701 | 318,505 | 2,322,191 | 11,610,955 | 25,544,101 | 127,720,505 |
| -1 | -5 | -11 | -55 | -401 | -2,005 | -4,411 | -5,791 | -22,055 | -28,955 | -63,701 | -318,505 | -2,322,191 | -11,610,955 | -25,544,101 | -127,720,505 |
Here are some more numbers to try:
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