口算练习与试题打印 is an iPhone application designed to help elementary school students improve their mental math skills. With regular practice, users can become proficient in mental calculations.

The app offers a wide range of math exercises and practice questions suitable for preschool to primary school levels. Users can choose to solve the exercises visually or by listening to the instructions. The app also provides automatic grading and checking of the answers, ensuring accurate and timely feedback.

In addition to online practice, the app allows users to print horizontal or vertical math exercise cards. The printing feature is optimized, offering options to select the type of questions, format, and sorting preferences.

The app also includes printable question types for popular mental math games like "24-Point Game," Sudoku, and Matchstick Puzzles.

Overall,口算练习与试题打印 is a useful tool for students to enhance their mental math skills and provides a variety of practice options for different grade levels.