■ App to practice subtraction and subtraction until the answer reaches 10 (Target: 1st grade elementary school students)■ The theme was Keisan Kaado (Tashizan Kaado, Hikizan Kaado), which is a school teaching material.■ The answer is a selection format (a format to select by pressing a button)■ You can choose between two modes, one that you can practice in order and the other that you can practice randomly.■ With a function to measure practice time (useful when recording time for homework)■ If you practice aloud, the practice effect may improve (?)■ Added an option to randomize the button layout (to prevent it from being remembered by the layout)
https://andro.io/app/onedigitaddsub
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