Mental Math

Mental Math Duel is a mental arithmetic trainer that helps you practice addition, subtraction, multiplication, and division in your head — no calculator needed. The app offers three modes: Quick Fire — answer as many questions as you can within 60 seconds. Questions get harder as your score increases. Survival — you have 3 lives. Each wrong answer costs one life. See how many questions you can answer correctly before running out. Daily Challenge — a fixed set of 20 questions. Complete them and track your accuracy and score each time you play. A streak system rewards consecutive correct answers with bonus points. Accuracy percentage and best streak are shown at the end of each session. The difficulty adjusts based on your performance — starting with simple addition and subtraction, then introducing multiplication and division as you progress. No account needed. No internet connection required. All data stays on your device.