Blue Viper on Instagram: "Children trained in mental abacus can perform impressive arithmetic calculations by visualizing an abacus in their minds. With years of practice, some can solve multi-digit addition and subtraction problems much faster than typical mental math methods. Mental abacus training is popular in several Asian countries and does show measurable benefits. Students learn to picture an abacus and manipulate it mentally, which can improve calculation speed, working memory, and conc