A:
Positive:
1 x 420155155 x 840310343 x 97710573 x 575555215 x 195421365 x 1151112677 x 156953139 x 13385
Negative:
-1 x -42015515-5 x -8403103-43 x -977105-73 x -575555-215 x -195421-365 x -115111-2677 x -15695-3139 x -13385
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 42,015,515, 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 | 42,015,515 | |
| -1 | -42,015,515 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 42,015,515.
Example:
1 x 42,015,515 = 42,015,515
and
-1 x -42,015,515 = 42,015,515
Notice both answers equal 42,015,515
With that explanation out of the way, let's continue. Next, we take the number 42,015,515 and divide it by 2:
42,015,515 ÷ 2 = 21,007,757.5
If the quotient is a whole number, then 2 and 21,007,757.5 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 | 42,015,515 | |
| -1 | -42,015,515 |
Now, we try dividing 42,015,515 by 3:
42,015,515 ÷ 3 = 14,005,171.6667
If the quotient is a whole number, then 3 and 14,005,171.6667 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 | 42,015,515 | |
| -1 | -42,015,515 |
Let's try dividing by 4:
42,015,515 ÷ 4 = 10,503,878.75
If the quotient is a whole number, then 4 and 10,503,878.75 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 | 42,015,515 | |
| -1 | 42,015,515 |
If you did it right, you will end up with this table:
| 1 | 5 | 43 | 73 | 215 | 365 | 2,677 | 3,139 | 13,385 | 15,695 | 115,111 | 195,421 | 575,555 | 977,105 | 8,403,103 | 42,015,515 |
| -1 | -5 | -43 | -73 | -215 | -365 | -2,677 | -3,139 | -13,385 | -15,695 | -115,111 | -195,421 | -575,555 | -977,105 | -8,403,103 | -42,015,515 |
Here are some more numbers to try:
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