A:
Positive:
1 x 6444307555 x 12888615189 x 7240795379 x 1700345445 x 14481591895 x 3400693821 x 16865519105 x 33731
Negative:
-1 x -644430755-5 x -128886151-89 x -7240795-379 x -1700345-445 x -1448159-1895 x -340069-3821 x -168655-19105 x -33731
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 644,430,755, 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 | 644,430,755 | |
| -1 | -644,430,755 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 644,430,755.
Example:
1 x 644,430,755 = 644,430,755
and
-1 x -644,430,755 = 644,430,755
Notice both answers equal 644,430,755
With that explanation out of the way, let's continue. Next, we take the number 644,430,755 and divide it by 2:
644,430,755 ÷ 2 = 322,215,377.5
If the quotient is a whole number, then 2 and 322,215,377.5 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 | 644,430,755 | |
| -1 | -644,430,755 |
Now, we try dividing 644,430,755 by 3:
644,430,755 ÷ 3 = 214,810,251.6667
If the quotient is a whole number, then 3 and 214,810,251.6667 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 | 644,430,755 | |
| -1 | -644,430,755 |
Let's try dividing by 4:
644,430,755 ÷ 4 = 161,107,688.75
If the quotient is a whole number, then 4 and 161,107,688.75 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 | 644,430,755 | |
| -1 | 644,430,755 |
If you did it right, you will end up with this table:
| 1 | 5 | 89 | 379 | 445 | 1,895 | 3,821 | 19,105 | 33,731 | 168,655 | 340,069 | 1,448,159 | 1,700,345 | 7,240,795 | 128,886,151 | 644,430,755 |
| -1 | -5 | -89 | -379 | -445 | -1,895 | -3,821 | -19,105 | -33,731 | -168,655 | -340,069 | -1,448,159 | -1,700,345 | -7,240,795 | -128,886,151 | -644,430,755 |
Here are some more numbers to try:
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