Q: What are the factor combinations of the number 157?
A:
Positive:
1 x 157
Negative:
-1 x -157
A:
Positive:
1 x 157
Negative:
-1 x -157
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 157, 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 | 157 | |
| -1 | -157 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 157.
Example:
1 x 157 = 157
and
-1 x -157 = 157
Notice both answers equal 157
With that explanation out of the way, let's continue. Next, we take the number 157 and divide it by 2:
157 ÷ 2 = 78.5
If the quotient is a whole number, then 2 and 78.5 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 | 157 | |
| -1 | -157 |
Now, we try dividing 157 by 3:
157 ÷ 3 = 52.3333
If the quotient is a whole number, then 3 and 52.3333 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 | 157 | |
| -1 | -157 |
Let's try dividing by 4:
157 ÷ 4 = 39.25
If the quotient is a whole number, then 4 and 39.25 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 | 157 | |
| -1 | 157 |
If you did it right, you will end up with this table:
| 1 | 157 |
| -1 | -157 |
Here are some more numbers to try:
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