Education Seven Tools of Secret Mathematics that Can Solve the Calculations Taught in Elementary School in 5 Seconds / Akito Genton

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

Education
A book of mathematics that can be used for elementary school students' learning and adults' relearning. It explains decimals, fractions and ratios from the basics, covering almost all arithmetic calculations. Not only the basics, but it also includes secret tools (secret techniques) for decimals and fractions. You will be able to do mental calculations such as continuous addition (1 + 2 + 3 +. + 10) which you learn after junior high school!