■ Introduction With this app, you can easily enjoy the mental arithmetic ability test, mental arithmetic, reading aloud calculation, flash mental arithmetic, and multiplication table check. Since we have an abacus, you can actually calculate it, or you can calculate using the actual abacus and answer using the app's abacus. Questions are always displayed as new ones, making it a perfect app for math practice. ■ Equipped with practice mode We have added a function to teach how to use the abacus