A:
Positive:
1 x 72201555 x 144403117 x 42471585 x 84943173 x 41735491 x 14705865 x 83472455 x 2941
Negative:
-1 x -7220155-5 x -1444031-17 x -424715-85 x -84943-173 x -41735-491 x -14705-865 x -8347-2455 x -2941
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 7,220,155, 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 | 7,220,155 | |
| -1 | -7,220,155 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 7,220,155.
Example:
1 x 7,220,155 = 7,220,155
and
-1 x -7,220,155 = 7,220,155
Notice both answers equal 7,220,155
With that explanation out of the way, let's continue. Next, we take the number 7,220,155 and divide it by 2:
7,220,155 ÷ 2 = 3,610,077.5
If the quotient is a whole number, then 2 and 3,610,077.5 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 | 7,220,155 | |
| -1 | -7,220,155 |
Now, we try dividing 7,220,155 by 3:
7,220,155 ÷ 3 = 2,406,718.3333
If the quotient is a whole number, then 3 and 2,406,718.3333 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 | 7,220,155 | |
| -1 | -7,220,155 |
Let's try dividing by 4:
7,220,155 ÷ 4 = 1,805,038.75
If the quotient is a whole number, then 4 and 1,805,038.75 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 | 7,220,155 | |
| -1 | 7,220,155 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 85 | 173 | 491 | 865 | 2,455 | 2,941 | 8,347 | 14,705 | 41,735 | 84,943 | 424,715 | 1,444,031 | 7,220,155 |
| -1 | -5 | -17 | -85 | -173 | -491 | -865 | -2,455 | -2,941 | -8,347 | -14,705 | -41,735 | -84,943 | -424,715 | -1,444,031 | -7,220,155 |
Here are some more numbers to try:
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