A:
Positive:
1 x 2105341555 x 4210683113 x 1619493519 x 1108074565 x 323898795 x 2216149247 x 8523651235 x 170473
Negative:
-1 x -210534155-5 x -42106831-13 x -16194935-19 x -11080745-65 x -3238987-95 x -2216149-247 x -852365-1235 x -170473
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 210,534,155, 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 | 210,534,155 | |
| -1 | -210,534,155 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 210,534,155.
Example:
1 x 210,534,155 = 210,534,155
and
-1 x -210,534,155 = 210,534,155
Notice both answers equal 210,534,155
With that explanation out of the way, let's continue. Next, we take the number 210,534,155 and divide it by 2:
210,534,155 ÷ 2 = 105,267,077.5
If the quotient is a whole number, then 2 and 105,267,077.5 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 | 210,534,155 | |
| -1 | -210,534,155 |
Now, we try dividing 210,534,155 by 3:
210,534,155 ÷ 3 = 70,178,051.6667
If the quotient is a whole number, then 3 and 70,178,051.6667 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 | 210,534,155 | |
| -1 | -210,534,155 |
Let's try dividing by 4:
210,534,155 ÷ 4 = 52,633,538.75
If the quotient is a whole number, then 4 and 52,633,538.75 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 | 210,534,155 | |
| -1 | 210,534,155 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 19 | 65 | 95 | 247 | 1,235 | 170,473 | 852,365 | 2,216,149 | 3,238,987 | 11,080,745 | 16,194,935 | 42,106,831 | 210,534,155 |
| -1 | -5 | -13 | -19 | -65 | -95 | -247 | -1,235 | -170,473 | -852,365 | -2,216,149 | -3,238,987 | -11,080,745 | -16,194,935 | -42,106,831 | -210,534,155 |
Here are some more numbers to try:
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