* Generate test expressions freely for mental arithmetic.
* Choose Hearing and Seeing Mental Arithmetic
* Check the exercise records carefully.
* Say the answer carelessly, the first mental arithmetic APP to introduce speech recognition
* Adjust the time of mental arithmetic at will.
* Edit expressions freely to make learning more symmetrical.
* Feel free to share expressions via Wechat or QQ.
* Use mental arithmetic to open expression files shared by Wechat or QQ.
* Feel free to transfer expressions to computers or other mobile phones.
* All kinds of walking functions wait for you to discover.