How do I find the factor combinations of the number 390,608?
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 390,608, it is easier to work with a table - it's called factoring from the outside in.
Outside in Factoring
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.
Why are the negative numbers included?
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 390,608.
Example:
1 x 390,608 = 390,608
and
-1 x -390,608 = 390,608
Notice both answers equal 390,608
With that explanation out of the way, let's continue. Next, we take the number 390,608 and divide it by 2:
390,608 ÷ 2 = 195,304
If the quotient is a whole number, then 2 and 195,304 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!
Here is what our table should look like at this step:
Now, we try dividing 390,608 by 3:
390,608 ÷ 3 = 130,202.6667
If the quotient is a whole number, then 3 and 130,202.6667 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:
Let's try dividing by 4:
390,608 ÷ 4 = 97,652
If the quotient is a whole number, then 4 and 97,652 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!
Here is what our table should look like at this step:
Keep dividing by the next highest number until you cannot divide anymore.
If you did it right, you will end up with this table:
More Examples
Here are some more numbers to try:
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