(Open Source) Mental Math vs Mental Math

A free, open-source mental math trainer. No ads, no paywalls, no locked content — every exercise and difficulty is included. Sharpen your arithmetic with quick timed tests, custom drills, and a library of mental-math tricks. Everything runs offline and your progress stays on your device. FEATURES Timed Tests A daily 60-second challenge plus sprints, a two-minute marathon, per-operation tests, and a hard mixed test — at four difficulty levels, each with best scores. Custom Trainer Pick a number domain (Times tables, Natural, Decimal, Money, Huge), choose one or more exercises, and set per-exercise difficulty from Easy to Super hard. All the Operations Addition, subtraction, multiplication, division, squares, square roots, fractions, percentages, and modulo. Mental Math Tricks Dozens of step-by-step tricks for faster addition, subtraction, multiplication, division, and squares — with worked examples and favorites. Practice Any Trick Every trick comes with a 60-second drill built for it: × 11 drills, squares ending in 5, numbers near 100, and more. Magic Square A number puzzle: make every row, column, and diagonal add up to the same total. Four levels, from 1-9 up to bigger number sets. Progress Tracking Solved totals, accuracy, best run, daily streak, longest streak, and a weekly activity view. Fast Sessions An on-screen keypad with instant answer checking and haptics. No ads. No paywalls. No account required. 100% Open Source The complete source code is public - see it, audit it, or contribute at https://github.com/Open-Apps-Studio/mental-math

Help your child build mental arithmetic skills one short level at a time. Mental Math is a simple addition and subtraction game designed for short, focused practice without countdowns or pressure. Start with small numbers and gradually progress to two- and three-digit calculations through 16 carefully structured levels. Each level contains just 10 questions, making it easy to fit a little practice into the day. FEATURES • Addition and subtraction up to three-digit numbers • 16 levels with gradually increasing difficulty • Short 10-question sessions • No countdown during exercises • Friendly feedback after every answer • Stars and personal bests • Complete history of previous attempts • Review every answer and correction • Light and dark appearance • VoiceOver and Dynamic Type support • Works completely offline Mental Math is designed to encourage practice rather than punish mistakes. Wrong answers are gently corrected, progress is never lost, and children can repeat levels as often as they like. No account. No sign-up. No advertising. No in-app purchases. Just mental arithmetic practice whenever you need it.