Practice vs 気持ち良い計算尺

Mental arithmetic isn't something you learn once — it's something you build through repetition. This app gives you a near-infinite supply of problems, letting you practice until any calculation feels effortless. Train with targeted drills for addition, subtraction, multiplication, and division. Focus on the operations that trip you up most, and go from uncertain to fluent. Built-in difficulty presets mean you can open the app and start immediately — no setup required. When you're ready to fine-tune, full customization is available: toggle carrying for addition, borrowing for subtraction, and set the exact number ranges for multiplication and division to suit your current skill level. The interface supports both light and dark mode, so it's comfortable to use anytime, anywhere. Multi-language support removes any language barrier to practice.

気持ち良い操作感にこだわった、新感覚の計算尺アプリです。 目盛を指で滑らせると、1・1.5・2・2.5…と0.5刻みで吸い付くようにスナップ。心地よいハプティックとともに、何度でも触りたくなる操作感を楽しめます。 計算尺を初めて使う方はもちろん、昔使っていた方にもおすすめです。 【主な機能】 ・掛け算モード ・割り算モード ・CI尺（逆尺）モード ・0.5刻みのスナップ吸着 ・心地よいハプティックフィードバック ・中央へ戻すボタン 正確な計算だけでなく、「滑らせる」「吸着する」という操作そのものを楽しめる、新しい計算尺を体験してください。