Large Math Drill vs FlashAnzan

Train Your Brain to Think in Billions. ■ Can your mental math keep up with high-stakes business? Most people freeze when they see numbers like a hundred million or a few trillion—but in boardrooms, pitch decks, and consulting interviews, that's just the starting point. If you can’t quickly estimate and compute large figures on the fly, you’re not just slow—you’re forgettable. This app gives you the edge: a powerful training ground for mastering the kind of numeric fluency that quietly separates decision-makers from everyone else. ■ What does the app do? It’s laser-focused: Choose your unit: Thousand, Million, Billion, Trillion Customize the number types: powers of 10, multiples of 5 Select operation types: Addition, Division, and more Tap Start and answer lightning-fast using a calculator-style interface The questions appear at the top, and your ability to instantly recognize, process, and act on large numbers is tested in real-time. ■ Track your progress, in numbers—not feelings. Forget vague notions of “I think I’m improving.” This app gives you hard data: Daily accuracy and time-per-question charts Mistakes are saved and recycled into focused review drills Compare historical stats to watch both speed and accuracy evolve ■ Why does it work? Forces your working memory to confront upper limits Strengthens mental arithmetic under pressure Encourages structural thinking even in a multiple-choice format ■ Who is this for? Aspiring consultants, analysts, and investment bankers Founders, execs, and anyone making real decisions with real numbers Students prepping for standardized tests, logic interviews, or competitive math Lifelong learners training for cognitive performance and sharper thinking ■ Use it for interview prep, case studies, quant drills, and more "Estimate the future market for a trillion-dollar industry." "Quickly calculate a rough ROI under time pressure." If those questions make you hesitate, you're not ready. This app builds the intuition and reflexes to handle such questions without blinking. It’s a secret weapon for case interviews, mental math assessments, business exams, and anywhere sharp numeric instincts are non-negotiable. ■ Other features Full English unit support: thousand, million, billion, trillion, quadrillion Clean, intuitive interface Customizable sound, color themes, and answer modes ■ Numbers Don’t Lie. Neither Should Your Brain. This isn’t just a calculator. It’s a mental transformation tool. People who speak the language of large numbers tend to get more respect, more responsibility, and more results. So don’t get left behind. Start training today—even one minute a day rewires the way you think.

Practice flash anzan (flash mental arithmetic) in the same format as the Japanese grading exam—and climb the ranks. GRADED MODE (30 RANKS, KYU 10 TO DAN 20) Each rank uses the exam's total-time format: numbers flash within a fixed total time, you answer 10 problems, and 70 points is a pass. Kyu 10–8 are free, and every higher rank includes one free try. A single one-time purchase unlocks all ranks (no subscription). YOUR GRADE IS KEPT Your best rank is recorded on the device and in iCloud, so it follows you to a new device. ANSWER BY VOICE Type on the number pad, or just say the answer. Speech recognition runs entirely on your device—your voice is never sent anywhere. FREE PRACTICE Set digits, count, and display time yourself—from slow single digits to 3-digit numbers at 0.3 seconds. IPHONE, IPAD AND MAC One purchase covers all three, and your grade follows you between them through iCloud. No ads. Available in nine languages: English, Japanese, Chinese (Simplified and Traditional), Korean, German, Spanish, French and Brazilian Portuguese. Note: This app is not affiliated with or endorsed by any certification body.