A:
Positive:
1 x 2211405555 x 4422811159 x 374814561 x 3625255295 x 749629305 x 7250513599 x 6144512289 x 17995
Negative:
-1 x -221140555-5 x -44228111-59 x -3748145-61 x -3625255-295 x -749629-305 x -725051-3599 x -61445-12289 x -17995
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 221,140,555, 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 | 221,140,555 | |
| -1 | -221,140,555 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 221,140,555.
Example:
1 x 221,140,555 = 221,140,555
and
-1 x -221,140,555 = 221,140,555
Notice both answers equal 221,140,555
With that explanation out of the way, let's continue. Next, we take the number 221,140,555 and divide it by 2:
221,140,555 ÷ 2 = 110,570,277.5
If the quotient is a whole number, then 2 and 110,570,277.5 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 | 221,140,555 | |
| -1 | -221,140,555 |
Now, we try dividing 221,140,555 by 3:
221,140,555 ÷ 3 = 73,713,518.3333
If the quotient is a whole number, then 3 and 73,713,518.3333 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 | 221,140,555 | |
| -1 | -221,140,555 |
Let's try dividing by 4:
221,140,555 ÷ 4 = 55,285,138.75
If the quotient is a whole number, then 4 and 55,285,138.75 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 | 221,140,555 | |
| -1 | 221,140,555 |
If you did it right, you will end up with this table:
| 1 | 5 | 59 | 61 | 295 | 305 | 3,599 | 12,289 | 17,995 | 61,445 | 725,051 | 749,629 | 3,625,255 | 3,748,145 | 44,228,111 | 221,140,555 |
| -1 | -5 | -59 | -61 | -295 | -305 | -3,599 | -12,289 | -17,995 | -61,445 | -725,051 | -749,629 | -3,625,255 | -3,748,145 | -44,228,111 | -221,140,555 |
Here are some more numbers to try:
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