Click the green flag, it should ask you to enter a ratio. Enter the ratio separating the numerator and the denominator with '/'. Then it will simplify it! For an example if you enter '6/18', it will return 1/3!
simplify(A,B) = A/GCD(A,B) , B/GCD(A,B) try entering a big fraction like 45689435897700/100 and it wont crash
