QuikMath

The app helps you improve mental math by giving ten questions that are randomly generated. You can pick easy, medium, or hard, but be warned, hard is very hard! And at the end, it will give you a summary of your performance. Good Luck! Also, I want to give a shout-out to one of my friends (name won't be disclosed for privacy) who helped me a lot to make this app, specifically the UI.

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