近代年号変換 vs Mental arithmetic quiz Uso & Estadísticas

Results: Statistics and display of results based on different users (local user roles), the total number of practice questions + the number of correct questions + the number of errors + the number that will be completed in the future, as well as the stars you have obtained and the achievements you have achieved; Challenge: quick start; addition operation; subtraction operation; multiplication operation; division operation; endless challenge; Question Bank: (Question Bank Settings) Configure configuration settings for various calculations and customize quizzes that suit you;