MATH DRILL
Mental math, practice on demand.
Generate random arithmetic problems, tune the range, count and difficulty, grade with one click and print for practice.
Everything runs locally in your browser
What is this?
Randomly generate add/subtract/multiply/divide problems with a chosen range and count, and a difficulty preset. Click “Grade” to auto-check answers and show a score; click “Print” to export a paper version.
示例与注意事项Example & notes
一个例子A worked example
出 20 道一年级 20 以内加减法，每题限时 10 秒：做完立刻看到正确率、平均用时与错题清单。Generate twenty grade-1 sums within 20 with a 10-second limit: finish and see accuracy, average time and the list of mistakes.
注意事项Things to watch
- 限时不是越短越好，先求准再求快，正确率稳定后再压缩时间。Shorter is not better — stabilise accuracy before tightening the clock.
- 错题集中练比整卷重做有效，重复做会的题只是在消耗耐心。Drill the misses instead of redoing whole sheets; repeating known questions just burns patience.
- 连续答对可以提高难度，长期停留在舒适区进步会很慢。Raise the difficulty after a streak — staying comfortable stalls progress.
相关问答More Q&A
能打印题目吗？Can I print the questions?
可以，支持导出为图片或 PDF 后打印，方便离线练习。Yes — export to an image or PDF and print for offline practice.
有哪几种题型？Which question types are available?
加减乘除、两步混合运算、填空与比大小都能出。Addition, subtraction, multiplication, division, two-step expressions, fill-in-the-blank and comparisons.