🧮 口算挑战Math Sprint
在线 60 秒口算挑战：加减法、乘除法或四则混合，三档数字范围（20 以内、100 以内、千以内与两位数乘除），答对自动进入下一题，统计答对、答错和连对数，记录每种题型的最好成绩；手机上有大号数字键盘，适合小学生练口算，也适合大人热身大脑。60-second mental math sprint online: addition and subtraction, multiplication and division, or all four mixed, with three number ranges (up to 20, up to 100, up to 1000 with bigger times tables). Correct answers move on automatically; correct, wrong and streak counts are shown and your best for each type is saved. A big number pad on phones makes it great for school kids and adults warming up alike.
看清算式后输入答案：答对会自动跳到下一题，数字位数够了却不对就算答错并清空重答；也可以按回车或 ✓ 提交。除法题都能整除，减法结果都不是负数。Type the answer: a correct one moves on automatically, and once you've typed enough digits for a wrong answer it counts as a mistake and clears. You can also press Enter or ✓ to submit. Divisions always come out exact and subtractions never go negative.
玩法说明与常见问题How to play & FAQ
「口算挑战」怎么玩？How do I play Math Sprint?
选择题型和数字范围后点「开始」，60 秒倒计时随即开始。每道题答对后立即出现下一题，所以速度越快答得越多。连续答对的次数会显示在“连对”里，答错一次就清零。比赛结束后会显示本局成绩，如果超过了这种题型的历史最好成绩，就会记录为新纪录。Choose a type and range, then press Start and the 60-second countdown begins. Each correct answer brings the next question straight away, so the faster you are the more you answer. Your run of consecutive correct answers is shown as the streak and resets on a mistake. At the end you see your score, and if it beats your best for that type it becomes the new record.
适合几年级的孩子？Which ages is it for?
“20 以内加减法”适合一年级，“100 以内”适合二三年级，乘除法对应九九乘法表；“千以内”和两位数乘除适合高年级或大人。Up to 20 suits first graders, up to 100 suits the next couple of years, and multiplication/division uses the times tables; up to 1000 and the bigger tables suit older kids and adults.
为什么输入一半就判错了？Why was my answer marked wrong halfway?
只有当你输入的位数已经和正确答案一样多、并且不对时才会判错；如果输入的是正确答案的开头部分，会继续等待你输完。An answer is only marked wrong once it has as many digits as the correct answer and doesn't match; if what you've typed is the start of the correct answer, it keeps waiting.
「口算挑战」免费吗？需要下载吗？Is Math Sprint free? Do I need to download anything?
完全免费，无需注册、下载或安装，打开网页就能玩，手机、平板和电脑都支持；游戏完全在你的浏览器本地运行，不会上传任何数据。It is completely free with no sign-up, download or install — just open the page on a phone, tablet or computer. The game runs entirely in your browser and nothing is uploaded.