A:
Positive:
1 x 2783815555 x 55676311139 x 2002745263 x 1058485695 x 4005491315 x 2116971523 x 1827857615 x 36557
Negative:
-1 x -278381555-5 x -55676311-139 x -2002745-263 x -1058485-695 x -400549-1315 x -211697-1523 x -182785-7615 x -36557
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 278,381,555, 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 | 278,381,555 | |
| -1 | -278,381,555 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 278,381,555.
Example:
1 x 278,381,555 = 278,381,555
and
-1 x -278,381,555 = 278,381,555
Notice both answers equal 278,381,555
With that explanation out of the way, let's continue. Next, we take the number 278,381,555 and divide it by 2:
278,381,555 ÷ 2 = 139,190,777.5
If the quotient is a whole number, then 2 and 139,190,777.5 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 | 278,381,555 | |
| -1 | -278,381,555 |
Now, we try dividing 278,381,555 by 3:
278,381,555 ÷ 3 = 92,793,851.6667
If the quotient is a whole number, then 3 and 92,793,851.6667 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 | 278,381,555 | |
| -1 | -278,381,555 |
Let's try dividing by 4:
278,381,555 ÷ 4 = 69,595,388.75
If the quotient is a whole number, then 4 and 69,595,388.75 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 | 278,381,555 | |
| -1 | 278,381,555 |
If you did it right, you will end up with this table:
| 1 | 5 | 139 | 263 | 695 | 1,315 | 1,523 | 7,615 | 36,557 | 182,785 | 211,697 | 400,549 | 1,058,485 | 2,002,745 | 55,676,311 | 278,381,555 |
| -1 | -5 | -139 | -263 | -695 | -1,315 | -1,523 | -7,615 | -36,557 | -182,785 | -211,697 | -400,549 | -1,058,485 | -2,002,745 | -55,676,311 | -278,381,555 |
Here are some more numbers to try:
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