How do I find the factor combinations of the number 648,224?
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 648,224, 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 648,224.
Example:
1 x 648,224 = 648,224
and
-1 x -648,224 = 648,224
Notice both answers equal 648,224
With that explanation out of the way, let's continue. Next, we take the number 648,224 and divide it by 2:
648,224 ÷ 2 = 324,112
If the quotient is a whole number, then 2 and 324,112 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 648,224 by 3:
648,224 ÷ 3 = 216,074.6667
If the quotient is a whole number, then 3 and 216,074.6667 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:
648,224 ÷ 4 = 162,056
If the quotient is a whole number, then 4 and 162,056 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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