19×19 暗算脳トレ vs Double Digits

19×19 暗算脳トレは、11×11〜19×19の二桁掛け算を楽しくマスターできるトレーニングアプリです。 【特徴】 ・ステージ制トレーニング 段ごとに問題を出題。正解を重ねると習熟度が上がり、新しいステージが解放されます。 ・タイムアタックモード 60秒で何問解けるか挑戦！新記録を目指してスコアを伸ばしましょう。 ・二乗トレーニング 11×11, 12×12…19×19を順番に出題。二乗の答えを素早く覚えられます。 ・苦手克服モード 間違えやすい問題を重点的に出題。弱点を効率よく克服できます。 ・成長の記録 正答率・連続日数・平均回答時間をグラフで確認。毎日の進捗が一目でわかります。 【こんな方におすすめ】 ・暗算力を鍛えたい方 ・計算が速くなりたい学生 ・脳トレを習慣にしたい方 ・子どもの算数学習をサポートしたい保護者 毎日少しずつ続けることで、二桁掛け算がスラスラ解けるようになります！

Answer two-digit multiplication in your head, instantly. Interview math, exam questions, quick estimates at work. When two-digit multiplication gets fast, the time you spent calculating goes back into thinking. Double Digits is a drill focused on one thing: solving two-digit multiplication again and again until it's fast. Use it to prepare for interviews and exams, or as a few minutes of daily brain training. ACE THE NUMBERS IN INTERVIEWS Consulting case interviews and trading firm mental math tests are done without a calculator. When two-digit multiplication comes instantly, you can keep your focus on the problem itself. PREPARE FOR EXAMS Many entrance exams don't allow calculators. Faster arithmetic leaves more time for the hard questions. BE QUICK WITH NUMBERS AT WORK "37 units at $48 each?" Answer on the spot in meetings and negotiations, and sanity-check estimates before you reach for a calculator. A DAILY WORKOUT FOR YOUR BRAIN Two-digit multiplication means holding numbers in your head while you calculate, which makes it an easy daily brain workout. Watch your times drop as you keep at it. PRACTICE FROM JUST 10 PROBLEMS In Practice, choose a number to learn and a range to multiply it by, and start with as few as 10 problems. It begins with 3 × 10–19. Go after your weak numbers and ranges as often as you like. CONQUER EVERY NUMBER FROM 1 TO 99 In Challenge, take on 90 problems: your chosen number times every two-digit number from 10 to 99. Solve them all to clear it, and work toward clearing all 99. SEE YOURSELF IMPROVE Every finished run records your time and adds it to a line chart. A line sloping downward is your progress. The days you practice are recorded too, so you can keep your streak going. COMPETE WITH OTHER PLAYERS Challenge supports Game Center leaderboards, with a separate board for every number, so you can aim for the top on your best numbers. Signing in is optional; every feature works without it. FEATURES - A drill focused on two-digit multiplication - Practice: start with just 10 problems - Challenge: 90 problems for each number from 1 to 99 - Best times and progress charts for each number and range - Daily streak tracking - Game Center leaderboards - Light and dark mode