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  2. Dataman - Wikipedia

    en.wikipedia.org/wiki/Dataman

    Dataman was an educational toy calculator with mathematical games to aid in learning arithmetic. [1] [2] It had an 8-digit vacuum fluorescent display (VFD), [3] and a keypad. [4] Dataman was manufactured by Texas Instruments [5] and was launched on 5 June 1977. [3] [6]

  3. Blackstone's Card Trick Without Cards - Wikipedia

    en.wikipedia.org/wiki/Blackstone's_Card_Trick...

    The series of mathematical manipulations results in any given card producing a unique number. The multiplication by 2 and 5 means that the final number is ten times the card's value, plus a fixed 15 (for the addition of 3 and the multiplication by 5) and an additional suit-dependent figure. Thus both suit and value are readily identifiable.

  4. Basic Math (video game) - Wikipedia

    en.wikipedia.org/wiki/Basic_Math_(video_game)

    Basic Math is an educational video game for the Atari Video Computer System (Atari VCS). [a] The game was developed at Atari, Inc. by Gary Palmer. The game involves a series of ten arithmetic problems involving addition, subtraction, multiplication, or division. The player can edit different gameplay modes to alter how the numbers in the ...

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  6. Chisanbop - Wikipedia

    en.wikipedia.org/wiki/Chisanbop

    The Chisanbop system. When a finger is touching the table, it contributes its corresponding number to a total. Chisanbop or chisenbop (from Korean chi (ji) finger + sanpŏp (sanbeop) calculation [1] 지산법/指算法), sometimes called Fingermath, [2] is a finger counting method used to perform basic mathematical operations.

  7. KenKen - Wikipedia

    en.wikipedia.org/wiki/KenKen

    As in Sudoku, the goal of each puzzle is to fill a grid with digits –– 1 through 4 for a 4×4 grid, 1 through 5 for a 5×5, 1 through 6 for a 6×6, etc. –– so that no digit appears more than once in any row or any column (a Latin square). Grids range in size from 3×3 to 9×9.