A:
Positive:
1 x 40212487161 x 6592211109 x 3689219197 x 2041243307 x 13098536649 x 6047912017 x 3346318727 x 21473
Negative:
-1 x -402124871-61 x -6592211-109 x -3689219-197 x -2041243-307 x -1309853-6649 x -60479-12017 x -33463-18727 x -21473
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 402,124,871, 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 | 402,124,871 | |
| -1 | -402,124,871 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 402,124,871.
Example:
1 x 402,124,871 = 402,124,871
and
-1 x -402,124,871 = 402,124,871
Notice both answers equal 402,124,871
With that explanation out of the way, let's continue. Next, we take the number 402,124,871 and divide it by 2:
402,124,871 ÷ 2 = 201,062,435.5
If the quotient is a whole number, then 2 and 201,062,435.5 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 | 402,124,871 | |
| -1 | -402,124,871 |
Now, we try dividing 402,124,871 by 3:
402,124,871 ÷ 3 = 134,041,623.6667
If the quotient is a whole number, then 3 and 134,041,623.6667 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 | 402,124,871 | |
| -1 | -402,124,871 |
Let's try dividing by 4:
402,124,871 ÷ 4 = 100,531,217.75
If the quotient is a whole number, then 4 and 100,531,217.75 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 | 402,124,871 | |
| -1 | 402,124,871 |
If you did it right, you will end up with this table:
| 1 | 61 | 109 | 197 | 307 | 6,649 | 12,017 | 18,727 | 21,473 | 33,463 | 60,479 | 1,309,853 | 2,041,243 | 3,689,219 | 6,592,211 | 402,124,871 |
| -1 | -61 | -109 | -197 | -307 | -6,649 | -12,017 | -18,727 | -21,473 | -33,463 | -60,479 | -1,309,853 | -2,041,243 | -3,689,219 | -6,592,211 | -402,124,871 |
Here are some more numbers to try:
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