This calculator can add, subtract, multiply, and divide fractions.
For instance if you enter 2/3 multiplied by 3/4 you get 1/2. Behind the scenes the math happens like so:
Multiply both numerators and denominators. Once it has that result you have the option of having it automatically reduced to the lowest possible denominator (6, 12) = 6 so the answer is 1/2.
Give it a try.
Subtract: 5⁄8 - 4⁄5 = 5 x 5⁄8 x 5 - 4 x 8⁄5 x 8 = 25⁄40 - 32⁄40 = 25 - 32⁄40 = -7⁄40