A:
Positive:
1 x 1619091855 x 3238183767 x 2416555335 x 483311479 x 3380151009 x 1604652395 x 676035045 x 32093
Negative:
-1 x -161909185-5 x -32381837-67 x -2416555-335 x -483311-479 x -338015-1009 x -160465-2395 x -67603-5045 x -32093
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 161,909,185, 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 | 161,909,185 | |
| -1 | -161,909,185 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 161,909,185.
Example:
1 x 161,909,185 = 161,909,185
and
-1 x -161,909,185 = 161,909,185
Notice both answers equal 161,909,185
With that explanation out of the way, let's continue. Next, we take the number 161,909,185 and divide it by 2:
161,909,185 ÷ 2 = 80,954,592.5
If the quotient is a whole number, then 2 and 80,954,592.5 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 | 161,909,185 | |
| -1 | -161,909,185 |
Now, we try dividing 161,909,185 by 3:
161,909,185 ÷ 3 = 53,969,728.3333
If the quotient is a whole number, then 3 and 53,969,728.3333 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 | 161,909,185 | |
| -1 | -161,909,185 |
Let's try dividing by 4:
161,909,185 ÷ 4 = 40,477,296.25
If the quotient is a whole number, then 4 and 40,477,296.25 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 | 161,909,185 | |
| -1 | 161,909,185 |
If you did it right, you will end up with this table:
| 1 | 5 | 67 | 335 | 479 | 1,009 | 2,395 | 5,045 | 32,093 | 67,603 | 160,465 | 338,015 | 483,311 | 2,416,555 | 32,381,837 | 161,909,185 |
| -1 | -5 | -67 | -335 | -479 | -1,009 | -2,395 | -5,045 | -32,093 | -67,603 | -160,465 | -338,015 | -483,311 | -2,416,555 | -32,381,837 | -161,909,185 |
Here are some more numbers to try:
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