A:
Positive:
1 x 2387386155 x 4774772337 x 645239547 x 5079545185 x 1290479235 x 10159091739 x 1372858695 x 27457
Negative:
-1 x -238738615-5 x -47747723-37 x -6452395-47 x -5079545-185 x -1290479-235 x -1015909-1739 x -137285-8695 x -27457
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 238,738,615, 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 | 238,738,615 | |
| -1 | -238,738,615 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 238,738,615.
Example:
1 x 238,738,615 = 238,738,615
and
-1 x -238,738,615 = 238,738,615
Notice both answers equal 238,738,615
With that explanation out of the way, let's continue. Next, we take the number 238,738,615 and divide it by 2:
238,738,615 ÷ 2 = 119,369,307.5
If the quotient is a whole number, then 2 and 119,369,307.5 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 | 238,738,615 | |
| -1 | -238,738,615 |
Now, we try dividing 238,738,615 by 3:
238,738,615 ÷ 3 = 79,579,538.3333
If the quotient is a whole number, then 3 and 79,579,538.3333 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 | 238,738,615 | |
| -1 | -238,738,615 |
Let's try dividing by 4:
238,738,615 ÷ 4 = 59,684,653.75
If the quotient is a whole number, then 4 and 59,684,653.75 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 | 238,738,615 | |
| -1 | 238,738,615 |
If you did it right, you will end up with this table:
| 1 | 5 | 37 | 47 | 185 | 235 | 1,739 | 8,695 | 27,457 | 137,285 | 1,015,909 | 1,290,479 | 5,079,545 | 6,452,395 | 47,747,723 | 238,738,615 |
| -1 | -5 | -37 | -47 | -185 | -235 | -1,739 | -8,695 | -27,457 | -137,285 | -1,015,909 | -1,290,479 | -5,079,545 | -6,452,395 | -47,747,723 | -238,738,615 |
Here are some more numbers to try:
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