Abacus Trainer is a question generator made in accord with the abacus skills acquired in addition and subtraction. It provides a whole range of options that can be flexibly selected to fit the drilling needs. The immense pool and combination of questions enhance the learning interest. Exercises can be focused on each four categories of addition and subtraction. Abacus training ranges from knowledge of beads- number translation, memorization, addition, subtraction, and mixed addition and subtraction for even a mixture of beads and numeric questions are included. Two modes are designed to fit different learning needs. Practice mode supports endless number of questions with no time limit, with the purpose of accuracy. Challenge mode requires answers to all the questions within the specific time limit, encouraging to boost speed as well as accuracy. No matter practice or challenge modes, the performance, score and every detail will be recorded in report, which is useful for learning progress monitoring. The report records assist you to find out the strength and weakness, a customized approach in abacus training can be derived as a result. Apart from doing the exercises directly on iPhone/iPad in a timed way, export both the quiz paper and the answer paper in PDF format to aid offline exercises. All questions are generated randomly to ensure no quiz paper will be identical. Print and email functions are also provided for your convenience. Interested in Abacus Tutorials? Please visit Mental Abacus Series at https://apps.apple.com/app/mental-abacus/id489127101