Q: What are the factor combinations of the number 77,987?
A:
Positive:
1 x 779877 x 1114113 x 599991 x 857
Negative:
-1 x -77987-7 x -11141-13 x -5999-91 x -857
A:
Positive:
1 x 779877 x 1114113 x 599991 x 857
Negative:
-1 x -77987-7 x -11141-13 x -5999-91 x -857
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 77,987, 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 | 77,987 | |
-1 | -77,987 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 77,987.
Example:
1 x 77,987 = 77,987
and
-1 x -77,987 = 77,987
Notice both answers equal 77,987
With that explanation out of the way, let's continue. Next, we take the number 77,987 and divide it by 2:
77,987 ÷ 2 = 38,993.5
If the quotient is a whole number, then 2 and 38,993.5 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 | 77,987 | |
-1 | -77,987 |
Now, we try dividing 77,987 by 3:
77,987 ÷ 3 = 25,995.6667
If the quotient is a whole number, then 3 and 25,995.6667 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 | 77,987 | |
-1 | -77,987 |
Let's try dividing by 4:
77,987 ÷ 4 = 19,496.75
If the quotient is a whole number, then 4 and 19,496.75 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 | 77,987 | |
-1 | 77,987 |
If you did it right, you will end up with this table:
1 | 7 | 13 | 91 | 857 | 5,999 | 11,141 | 77,987 |
-1 | -7 | -13 | -91 | -857 | -5,999 | -11,141 | -77,987 |
Here are some more numbers to try:
Try the factor calculator