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2. Soroban - Wikipedia

   en.wikipedia.org/wiki/Soroban

   A suanpan (top) and a soroban (bottom). The two abaci seen here are of standard size and have thirteen rods each. Another variant of soroban. The soroban is composed of an odd number of columns or rods, each having beads: one separate bead having a value of five, called go-dama (五玉, ごだま, "five-bead") and four beads each having a value of one, called ichi-dama (一玉, いちだま ...

3. Trachtenberg system - Wikipedia

   en.wikipedia.org/wiki/Trachtenberg_system

   The method for general multiplication is ... 7+7=14 6+6=12 8+8=16 9+9=18 ... The 2017 American film Gifted revolves around a child prodigy who at the age of 7 ...

4. Numeracy - Wikipedia

   en.wikipedia.org/wiki/Numeracy

   Numeracy has an influence on healthy behaviors, financial literacy, and career decisions. Therefore, innumeracy may negatively affect economic choices, financial outcomes, health outcomes, and life satisfaction. [3][4][5] It also may distort risk perception in health decisions. [6] Greater numeracy has been associated with reduced ...

5. KenKen - Wikipedia

   en.wikipedia.org/wiki/KenKen

   A simple KenKen puzzle, with answers filled in as large numbers. KenKen and KenDoku are trademarked names for a style of arithmetic and logic puzzle invented in 2004 by Japanese math teacher Tetsuya Miyamoto, [1] who intended the puzzles to be an instruction-free method of training the brain. [2] The name derives from the Japanese word for ...

6. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for arithmetic operations ...

7. Brain Age: Train Your Brain in Minutes a Day! - Wikipedia

   en.wikipedia.org/wiki/Brain_Age:_Train_Your_Brain...

   As of January 22, 2007, Brain Age has sold over 2 million copies in Europe. [33] As of October 30, 2007, Brain Age has sold over one million copies in the United Kingdom. [34] It was the 10th best-selling Nintendo DS game of December 2008 in the United States. [35] As of September 30, 2015, Brain Age has worldwide sales of 19.01 million. [36]