A:
Positive:
1 x 2117425555 x 4234851119 x 1114434531 x 683040595 x 2228869155 x 1366081589 x 3594952945 x 71899
Negative:
-1 x -211742555-5 x -42348511-19 x -11144345-31 x -6830405-95 x -2228869-155 x -1366081-589 x -359495-2945 x -71899
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 211,742,555, 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 | 211,742,555 | |
| -1 | -211,742,555 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 211,742,555.
Example:
1 x 211,742,555 = 211,742,555
and
-1 x -211,742,555 = 211,742,555
Notice both answers equal 211,742,555
With that explanation out of the way, let's continue. Next, we take the number 211,742,555 and divide it by 2:
211,742,555 ÷ 2 = 105,871,277.5
If the quotient is a whole number, then 2 and 105,871,277.5 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 | 211,742,555 | |
| -1 | -211,742,555 |
Now, we try dividing 211,742,555 by 3:
211,742,555 ÷ 3 = 70,580,851.6667
If the quotient is a whole number, then 3 and 70,580,851.6667 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 | 211,742,555 | |
| -1 | -211,742,555 |
Let's try dividing by 4:
211,742,555 ÷ 4 = 52,935,638.75
If the quotient is a whole number, then 4 and 52,935,638.75 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 | 211,742,555 | |
| -1 | 211,742,555 |
If you did it right, you will end up with this table:
| 1 | 5 | 19 | 31 | 95 | 155 | 589 | 2,945 | 71,899 | 359,495 | 1,366,081 | 2,228,869 | 6,830,405 | 11,144,345 | 42,348,511 | 211,742,555 |
| -1 | -5 | -19 | -31 | -95 | -155 | -589 | -2,945 | -71,899 | -359,495 | -1,366,081 | -2,228,869 | -6,830,405 | -11,144,345 | -42,348,511 | -211,742,555 |
Here are some more numbers to try:
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