A:
Positive:
1 x 81817242111 x 74379311109 x 7506169131 x 62455911199 x 6823791441 x 5677815209 x 15706914279 x 57299
Negative:
-1 x -818172421-11 x -74379311-109 x -7506169-131 x -6245591-1199 x -682379-1441 x -567781-5209 x -157069-14279 x -57299
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 818,172,421, 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 | 818,172,421 | |
| -1 | -818,172,421 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 818,172,421.
Example:
1 x 818,172,421 = 818,172,421
and
-1 x -818,172,421 = 818,172,421
Notice both answers equal 818,172,421
With that explanation out of the way, let's continue. Next, we take the number 818,172,421 and divide it by 2:
818,172,421 ÷ 2 = 409,086,210.5
If the quotient is a whole number, then 2 and 409,086,210.5 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 | 818,172,421 | |
| -1 | -818,172,421 |
Now, we try dividing 818,172,421 by 3:
818,172,421 ÷ 3 = 272,724,140.3333
If the quotient is a whole number, then 3 and 272,724,140.3333 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 | 818,172,421 | |
| -1 | -818,172,421 |
Let's try dividing by 4:
818,172,421 ÷ 4 = 204,543,105.25
If the quotient is a whole number, then 4 and 204,543,105.25 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 | 818,172,421 | |
| -1 | 818,172,421 |
If you did it right, you will end up with this table:
| 1 | 11 | 109 | 131 | 1,199 | 1,441 | 5,209 | 14,279 | 57,299 | 157,069 | 567,781 | 682,379 | 6,245,591 | 7,506,169 | 74,379,311 | 818,172,421 |
| -1 | -11 | -109 | -131 | -1,199 | -1,441 | -5,209 | -14,279 | -57,299 | -157,069 | -567,781 | -682,379 | -6,245,591 | -7,506,169 | -74,379,311 | -818,172,421 |
Here are some more numbers to try:
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