I don't like this app. When I when on it it said 7+12= . i put 19 but it was wrong. It made ne verry confuesed so i whent on calcutor and typed 12+7=19 so this is why i dont like it if they would put a a random number and it said it was correct . i there life they may do a test and it will ask you 12+7=19 but you put a a random nunber insted and u mait fail