A:
Positive:
1 x 2113206137 x 3018865967 x 3154039107 x 1974959469 x 450577749 x 2821374211 x 501837169 x 29477
Negative:
-1 x -211320613-7 x -30188659-67 x -3154039-107 x -1974959-469 x -450577-749 x -282137-4211 x -50183-7169 x -29477
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 211,320,613, 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 | 211,320,613 | |
| -1 | -211,320,613 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 211,320,613.
Example:
1 x 211,320,613 = 211,320,613
and
-1 x -211,320,613 = 211,320,613
Notice both answers equal 211,320,613
With that explanation out of the way, let's continue. Next, we take the number 211,320,613 and divide it by 2:
211,320,613 ÷ 2 = 105,660,306.5
If the quotient is a whole number, then 2 and 105,660,306.5 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 | 211,320,613 | |
| -1 | -211,320,613 |
Now, we try dividing 211,320,613 by 3:
211,320,613 ÷ 3 = 70,440,204.3333
If the quotient is a whole number, then 3 and 70,440,204.3333 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 | 211,320,613 | |
| -1 | -211,320,613 |
Let's try dividing by 4:
211,320,613 ÷ 4 = 52,830,153.25
If the quotient is a whole number, then 4 and 52,830,153.25 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 | 211,320,613 | |
| -1 | 211,320,613 |
If you did it right, you will end up with this table:
| 1 | 7 | 67 | 107 | 469 | 749 | 4,211 | 7,169 | 29,477 | 50,183 | 282,137 | 450,577 | 1,974,959 | 3,154,039 | 30,188,659 | 211,320,613 |
| -1 | -7 | -67 | -107 | -469 | -749 | -4,211 | -7,169 | -29,477 | -50,183 | -282,137 | -450,577 | -1,974,959 | -3,154,039 | -30,188,659 | -211,320,613 |
Here are some more numbers to try:
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