A:
Positive:
1 x 2103211555 x 4206423111 x 1912010555 x 3824021131 x 1605505655 x 3211011441 x 1459557205 x 29191
Negative:
-1 x -210321155-5 x -42064231-11 x -19120105-55 x -3824021-131 x -1605505-655 x -321101-1441 x -145955-7205 x -29191
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 210,321,155, 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 | 210,321,155 | |
| -1 | -210,321,155 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 210,321,155.
Example:
1 x 210,321,155 = 210,321,155
and
-1 x -210,321,155 = 210,321,155
Notice both answers equal 210,321,155
With that explanation out of the way, let's continue. Next, we take the number 210,321,155 and divide it by 2:
210,321,155 ÷ 2 = 105,160,577.5
If the quotient is a whole number, then 2 and 105,160,577.5 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 | 210,321,155 | |
| -1 | -210,321,155 |
Now, we try dividing 210,321,155 by 3:
210,321,155 ÷ 3 = 70,107,051.6667
If the quotient is a whole number, then 3 and 70,107,051.6667 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 | 210,321,155 | |
| -1 | -210,321,155 |
Let's try dividing by 4:
210,321,155 ÷ 4 = 52,580,288.75
If the quotient is a whole number, then 4 and 52,580,288.75 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 | 210,321,155 | |
| -1 | 210,321,155 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 131 | 655 | 1,441 | 7,205 | 29,191 | 145,955 | 321,101 | 1,605,505 | 3,824,021 | 19,120,105 | 42,064,231 | 210,321,155 |
| -1 | -5 | -11 | -55 | -131 | -655 | -1,441 | -7,205 | -29,191 | -145,955 | -321,101 | -1,605,505 | -3,824,021 | -19,120,105 | -42,064,231 | -210,321,155 |
Here are some more numbers to try:
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