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！

How fast can you solve 7 × 38 in your head? Double Digits is a drill for people who want to multiply two-digit numbers quickly. CONQUER EVERY NUMBER FROM 1 TO 99 The home screen is a grid of the numbers 1 to 99. Pick one and you get all 90 combinations of that number with every two-digit number, from 10 to 99. Solve them all and the number is cleared. Each cleared number keeps your best time. Filling in all 99 is the goal. WATCH YOURSELF GET FASTER Take on the same number again and your times are drawn as a line chart. The horizontal axis is your attempt number, the vertical axis is your finishing time. A line sloping downward is progress you can see. The days you practice are recorded automatically, along with your current streak. PRACTICE ANY COMBINATION Want to drill only 7 and 8, and only against the 20s? You can pick exactly which numbers to learn and what to multiply them by, so you can attack your weak spots directly. INPUT THAT KEEPS UP The keypad handles multiple fingers at once, so nothing is dropped no matter how fast you type. Correct answers give a light haptic tap and a sound, then move straight on. COMPETE GLOBALLY Leaderboards are supported through Game Center, with a separate board for every number. Signing in is optional; decline it and every practice feature still works. Light and dark appearance are both supported, following your device setting automatically.