MentalMultiply vs (Open Source) Mental Math

Mental Multiply teaches you how to multiply faster using the Trachtenberg System and powerful pattern-based mental-math techniques. Designed for students, adults, teachers, and mental-math enthusiasts, Mental Multiply turns multiplication into a practical skill you can understand, practice, and improve. Create personalized exercises based on your level and choose whether to solve the complete calculation process or focus only on the final answer. Learn Faster Multiplication Methods • Practice the Trachtenberg multiplication rules • Discover shortcuts for numbers close to 10, 20, 100, and 200 • Learn the “same tens, units add to 10” pattern • Follow clear, step-by-step explanations • Recognize useful number patterns and solve problems more efficiently Personalized Practice • Practice individual multiplication tables or combine several multipliers • Choose the number of digits in each exercise • Adjust the difficulty from beginner to advanced • Practice complete guided calculations or final answers only • Receive immediate feedback as you work Choose Your Calculation Direction Practice using: • The familiar left-to-right answer-entry direction • The Trachtenberg right-to-left working method This helps you learn the method in the way that feels most natural to you. Built for Continuous Improvement • Clean, distraction-free design • Structured practice sessions • Progress tracking and performance insights • Exercises for different experience levels • Support for multiple languages Mental Multiply is ideal for: • Students developing stronger multiplication skills • Adults who want to sharpen their mental arithmetic • Teachers demonstrating alternative calculation methods • Mental-math enthusiasts • Anyone preparing for mathematics or aptitude challenges Move beyond memorization. Learn the rules, recognize the patterns, and build the confidence to calculate faster in your head. Download Mental Multiply and start training your brain today. Some features may require an in-app purchase. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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