Ishido's Challenge! Adult Abacus Mental Arithmetic Drills: Videos and Audio Readings to Activate Your Right Brain! (A book t

★ Master the fast and accurate mental arithmetic skills unique to abacus calculations. ★ Challenge yourself with QR codes. ★ Master the skills through training with flash mental arithmetic and read-aloud calculations. ★ Improve not only your calculation skills, but also your concentration, memory, and logical thinking! ◇◆◇ Comment from the Editor ◇◆◇ On quiz and brain training programs, we often see contestants with a strong mathematical background and advanced skills quickly answer questions correctly. This ability is something everyone, from elementary school students to seniors, wants to acquire. This demand has led to a boom in books with titles like XX calculation method or XX calculation method. However, these books only explain calculation techniques and require paper and pencil. This book uses a calculation method based on abacus calculations to improve your mental arithmetic. Abacus calculations are performed by flipping beads. The abacus method of mental arithmetic involves simply recreating this process in your mind. Mental arithmetic is a very useful calculation skill, allowing you to handle any number of numbers without a calculator. In school classes and tests, fast calculation speed and a quick mind are major advantages. Even older people can activate their brains by regularly being exposed to numbers through mental arithmetic. This book is for people who have some experience with abacus, as well as beginners. It uses an abacus to help them learn simple bead movements such as 1 + 1, while also building their mental arithmetic skills. By gradually improving your skills, you can put them to good use in everyday shopping, overseas travel, and accounting. It would be a great pleasure if mental arithmetic, or the abacus, could have a positive impact on the mind and brain, enriching your daily lives. ◇◆◇ Main Contents ◇◆◇ ☆ PART 1 Improve your mental arithmetic skills with abacus * Mental arithmetic without writing it down * Check the names of the parts * Use a transparent abacus ...etc. ☆ PART 2 Easy mental arithmetic training * Move the beads up and down while calculating * Move the beads simultaneously with two fingers * Add 5 beads, then subtract 1 bead ...etc. ☆ PART 3 Mental arithmetic with carryover and borrowover * Read the table and then move the beads * Subtract 1, then add 10; Subtract 10, then add 1 * Subtract 2, then add 10; Subtract 10, then add 2 ...etc. ☆ PART 4 Improve your skills! Mental arithmetic training * Listen to numbers read out loud and do mental arithmetic * Look at the numbers displayed on the screen and do mental arithmetic * Mental arithmetic training with a visual mental arithmetic text ...etc.