- Subtraction practice program for elementary school students.
- You can specify any number of digits.
- The number of questions is 10 questions, up to 50 questions, and the questions are randomly generated each time, so you cannot remember the answers.
- With the answer matching function, you can redo until all the questions are answered correctly.
- "Check the answers" will not reset existing questions no matter how many times you click.
- Please note that clicking "New questions" will reset the existing questions.