Papimathic is a free mental math app for kids and adults, inspired by the classic Little Professor electronic toy. Practice addition, subtraction, multiplication, and division across 5 progressive difficulty levels. A dedicated multiplication table mode lets you drill any specific table at your own pace. Each session is 5 questions — get 5/5 stars to unlock a celebration animation and beat your best time. Short, focused, and motivating. Works fully offline. Available on iOS and Android.