Book (Practical) Mathematics The strongest drill that enables elementary school students to perform up to 99 x 99 calculations in their minds / Kuniaki Iwanami

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

Mathematics
Master 2-digit multiplication up to 99 × 99. Although mathematics is the basis of mathematics, it is also used in other subjects and plays a role in supporting basic academic achievement. On the other hand, it is attracting attention from a wide range of generations for purposes such as junior high school entrance exams and BRAIN AGE: Train Your Brain in Minutes a Day! for the prevention of dementia. Many books related to mathematics have been published. Especially in recent junior high school entrance exams, the ability to solve as quickly as possible is required, and learning techniques to solve quickly and accurately is essential. This time, the book "Can be done in 6 hours! 2-digit × 2-digit mental calculation Iwanami method ghost mental calculation" published in 2011 became a big hit. Dr. Kuniaki Iwanami, a doctor who graduated from the University of Tokyo's School of Medicine and is a student at Stanford Graduate School, developed a completely new 2-digit × 2-digit mental calculation method. The advanced calculation method "Ayumi-san," which is much simpler than the previous book, is explained in an easy-to-understand drill format that can solve faster than hand calculation. If you master this "Ayumi-san," you will improve your spatial recognition ability, acquire the ability to think logically, and also become fond of mathematics. It is the strongest drill that enables elementary school children to master 8100 patterns of 2-digit multiplication in a week.