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  2. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    For the leading zero, subtract 1 from the neighbor. For rules 9, 8, 4, and 3 only the first digit is subtracted from 10. After that each digit is subtracted from nine instead. Example: 2,130 × 9 = 19,170 Working from right to left: (10 − 0) + 0 = 10. Write 0, carry 1. (9 − 3) + 0 + 1 (carried) = 7. Write 7. (9 − 1) + 3 = 11. Write 1 ...

  3. Professor Kageyama's Maths Training: The Hundred Cell ...

    en.wikipedia.org/wiki/Professor_Kageyama's_Maths...

    It was released in North America as Personal Trainer: Math on January 12, 2009 [2] and also in South Korea in 2009. The game is part of both the Touch! Generations and Personal Trainer series. [3] The game received mixed reviews, with common criticisms cited for the game's difficulty in recognizing some numbers and for not being very ...

  4. Chisanbop - Wikipedia

    en.wikipedia.org/wiki/Chisanbop

    36 represented in chisanbop, where four fingers and a thumb are touching the table and the rest of the digits are raised. The three fingers on the left hand represent 10+10+10 = 30; the thumb and one finger on the right hand represent 5+1=6. Counting from 1 to 20 in Chisanbop. Each finger has a value of one, while the thumb has a value of five.

  5. Guess 2/3 of the average - Wikipedia

    en.wikipedia.org/wiki/Guess_2/3_of_the_average

    In game theory, "guess ⁠ 2 / 3 ⁠ of the average" is a game where players simultaneously select a real number between 0 and 100, inclusive. The winner of the game is the player(s) who select a number closest to ⁠ 2 / 3 ⁠ of the average of numbers chosen by all players.

  6. Leitner system - Wikipedia

    en.wikipedia.org/wiki/Leitner_system

    For example, if this is session 0, boxes 0-2-5-9, 1-3-6-0, 5-7-0-4, and 8-0-3-7 are done because they all contain the number 0. If a reviewed card isn't successful, it moves back to Deck Current. If a reviewed card is successful and the last number of its box matches the current session number, then that card moves to the Retired Deck.

  7. Mental abacus - Wikipedia

    en.wikipedia.org/wiki/Mental_abacus

    Calculations can be made at great speed in this way. For example, in the Flash Anzan event at the All Japan Soroban Championship, champion Takeo Sasano was able to add fifteen three-digit numbers in just 1.7 seconds. [2] This system is being propagated in China, [3] Singapore, South Korea, Thailand, Malaysia, and Japan. Mental calculation is ...

  8. Prodigy Math Game - Wikipedia

    en.wikipedia.org/wiki/Prodigy_Math_Game

    The player takes the role of a wizard or witch, who, whilst undertaking quests to collect gems, must battle against the Puppet Master. These quests usually involve battling monsters in different areas of the in-game map. To participate in these quests, players must correctly answer math problems to cast spells. Prodigy Math was released in 2011 ...

  9. Grid method multiplication - Wikipedia

    en.wikipedia.org/wiki/Grid_method_multiplication

    The grid method (also known as the box method) of multiplication is an introductory approach to multi-digit multiplication calculations that involve numbers larger than ten. Because it is often taught in mathematics education at the level of primary school or elementary school , this algorithm is sometimes called the grammar school method.