Library Mathematics Introduction to Indian Mathematics and Mental Arithmetic / Hirofumi Sato

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Mathematics
[Introduction to Contents]
In line with the recent revival of double-digit multiplication and Indian mathematics books, we revised and re-edited the Drill 』 for Introduction to Indian Mathematics with 『 calculation power published by Nagaoka Shoten in 2007, and newly appeared as a book in "Nagaoka bunko".
In order to explain the basic parts of Indian Mathematics (such as calculations using complements and multiplication up to 19 × 19) which are often taken up in drill-style books, we increased the number of questions for each step in order to understand it while solving it.
Add, subtract, multiply, divide, and so on. The number of questions per step is increased.
Add, subtract, multiply, divide, and so on. 13
2 Basics of Indian Mathematics (1) 2-digit multiplication 18
3-digit multiplication 23
4
4 Indian subtraction (1) 2-digit addition 18
3 Indian subtraction (2) 2-digit addition 23
4 Indian subtraction (1) subtraction from 1000. 28
5 Indian subtraction (2) visible digits down. 33
Chapter 2 Methods Abundant Indian Mathematics. 39
1 Surprising multiplication from 11 br>
15 Indian Formula (4) Irregular Numbers (1). 115
16 Indian Formula (5) Irregular Numbers (2). 122
17 If the first digit is "5 2nd is easy (1) If the 2nd digit is" 5 ", the 2nd is easy (2) If the 1st digit is" 5 ", the 2nd is easy (1) If the 1st digit is" 5 ", the 2nd is easy (2) If the 1st digit is" 5 ", the 2nd is easy (2) If the 3rd digit is" 5 ", the 2nd is easy (113
Chapter 3 Using the secret of numbers wisely Indian Formula (141
1 Divided by 9 (1) If the 2nd digit is divided by" 9 "(1) If the 2nd digit is divided by" 9 "(2) If the 3rd digit is divided by" 9 "(1) If the 2nd digit is divided by" 9 "(1) If the 2nd digit is divided by" 9 "(2) If the 3rd digit is divided by" 9 "(3) Calculations requiring extra processing : 153
4 Calculated by a good number of" kiri "(1) … 160 143 148 168 176 153 389 999 101 108 131