A:
Positive:
1 x 778000255 x 1556000525 x 311200153 x 146792571 x 1095775265 x 293585355 x 219155827 x 940751325 x 587171775 x 438313763 x 206754135 x 18815
Negative:
-1 x -77800025-5 x -15560005-25 x -3112001-53 x -1467925-71 x -1095775-265 x -293585-355 x -219155-827 x -94075-1325 x -58717-1775 x -43831-3763 x -20675-4135 x -18815
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 77,800,025, 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 | 77,800,025 | |
| -1 | -77,800,025 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 77,800,025.
Example:
1 x 77,800,025 = 77,800,025
and
-1 x -77,800,025 = 77,800,025
Notice both answers equal 77,800,025
With that explanation out of the way, let's continue. Next, we take the number 77,800,025 and divide it by 2:
77,800,025 ÷ 2 = 38,900,012.5
If the quotient is a whole number, then 2 and 38,900,012.5 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 | 77,800,025 | |
| -1 | -77,800,025 |
Now, we try dividing 77,800,025 by 3:
77,800,025 ÷ 3 = 25,933,341.6667
If the quotient is a whole number, then 3 and 25,933,341.6667 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 | 77,800,025 | |
| -1 | -77,800,025 |
Let's try dividing by 4:
77,800,025 ÷ 4 = 19,450,006.25
If the quotient is a whole number, then 4 and 19,450,006.25 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 | 77,800,025 | |
| -1 | 77,800,025 |
If you did it right, you will end up with this table:
| 1 | 5 | 25 | 53 | 71 | 265 | 355 | 827 | 1,325 | 1,775 | 3,763 | 4,135 | 18,815 | 20,675 | 43,831 | 58,717 | 94,075 | 219,155 | 293,585 | 1,095,775 | 1,467,925 | 3,112,001 | 15,560,005 | 77,800,025 |
| -1 | -5 | -25 | -53 | -71 | -265 | -355 | -827 | -1,325 | -1,775 | -3,763 | -4,135 | -18,815 | -20,675 | -43,831 | -58,717 | -94,075 | -219,155 | -293,585 | -1,095,775 | -1,467,925 | -3,112,001 | -15,560,005 | -77,800,025 |
Here are some more numbers to try:
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