correction needed
Ten's complement practice lesson have incorrect answers.
Insightful tips
Lots of fun techniques to make mental arithmetic a bit easier. Would love to see more tricks added in the future.
Broken Game Mechanics
When you play it doesn’t tell you if you got the question right or wrong.
And in the timed games it always says you got the last question wrong because the question wasn’t answered. The last question in a timed game can never be answered - therefore it should not be counted in the total.
And in the timed games it always says you got the last question wrong because the question wasn’t answered. The last question in a timed game can never be answered - therefore it should not be counted in the total.
Quase perfeito!
Falta o modo escuro e outros idiomas, como o português. No resto é excelente!
Great app
No nonsense, bite sized concepts with huge potential to improve your calculation skill. This app was clearly designed by a minimalist. It has everything you need and expect with no time wasters or fillers.








