Fractions represent divisions, when the numerator (number on top) and the denominator (number on the bottom) have different signs it means that the quotient between both numbers is negative.
For example
-When the numerator is negative:
The quotient is negative, you can directly write it as a negative fraction
- When the denominator is negative:
The quotient will also be negative, so the fraction can be expressed as a negative fraction too
- When both values have the same sign, then the quotient is positive: