24点运算 vs TwentyFour

运算24点是一款经典的数学益智应用。用给定的四个数字（1～9），通过加、减、乘、除和括号，算出结果为 24。每个数字必须用且只能用一次，既能锻炼心算与逻辑，又适合休闲动脑。 【玩法简单】 • 选择或随机生成 4 个 1～9 的数字 • 点击「计算24点」即可看到所有能得到 24 的算式 • 支持随机出题，遇到无解可换题再试 • 历史记录保存近期题目与解法数量，方便回顾 【适合谁玩】 • 中小学生：练习四则运算与括号运用 • 家长：陪孩子一起玩，寓教于乐 • 喜欢数独、心算的玩家：轻量级脑力挑战 • 通勤、休息时想动脑的上班族 【应用特点】 • 只展示整数运算结果，无分数，易理解 • 一次展示多种解法，可学习不同思路 • 无广告、无内购，界面简洁 • 支持 iPhone 与 iPad，横竖屏皆可 无论你是想练口算、消遣，还是单纯喜欢 24 点，都欢迎下载试试。

Make exactly 24 using four numbers—and discover how many elegant paths hide in simple arithmetic. TwentyFour is a calm, handcrafted number puzzle for iPhone and iPad. Tap cards in calculation order and choose +, −, ×, or ÷ either between the two cards or after selecting both. Keep combining until one exact result remains. Every number must be used exactly once. Features: • 120 verified puzzles across six progressive chapters • Exact fractions and negative intermediate results • Step hints, undo, redo, restart, and full solutions • Three-star goals based on hints, time, and efficient moves • A deterministic daily challenge that works offline • Free practice with adjustable difficulty • Achievements and local statistics • Dark Mode, Dynamic Type, VoiceOver, and Reduce Motion • No ads, accounts, in-app purchases, analytics, or network connection There is no failure countdown. Take your time, experiment, and build stronger number sense at your own pace. Can you make 24?