A:
Positive:
1 x 102512155 x 205024313 x 78855523 x 44570565 x 157711115 x 89141299 x 342851495 x 6857
Negative:
-1 x -10251215-5 x -2050243-13 x -788555-23 x -445705-65 x -157711-115 x -89141-299 x -34285-1495 x -6857
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 10,251,215, 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 | 10,251,215 | |
| -1 | -10,251,215 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 10,251,215.
Example:
1 x 10,251,215 = 10,251,215
and
-1 x -10,251,215 = 10,251,215
Notice both answers equal 10,251,215
With that explanation out of the way, let's continue. Next, we take the number 10,251,215 and divide it by 2:
10,251,215 ÷ 2 = 5,125,607.5
If the quotient is a whole number, then 2 and 5,125,607.5 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 | 10,251,215 | |
| -1 | -10,251,215 |
Now, we try dividing 10,251,215 by 3:
10,251,215 ÷ 3 = 3,417,071.6667
If the quotient is a whole number, then 3 and 3,417,071.6667 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 | 10,251,215 | |
| -1 | -10,251,215 |
Let's try dividing by 4:
10,251,215 ÷ 4 = 2,562,803.75
If the quotient is a whole number, then 4 and 2,562,803.75 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 | 10,251,215 | |
| -1 | 10,251,215 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 23 | 65 | 115 | 299 | 1,495 | 6,857 | 34,285 | 89,141 | 157,711 | 445,705 | 788,555 | 2,050,243 | 10,251,215 |
| -1 | -5 | -13 | -23 | -65 | -115 | -299 | -1,495 | -6,857 | -34,285 | -89,141 | -157,711 | -445,705 | -788,555 | -2,050,243 | -10,251,215 |
Here are some more numbers to try:
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