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  2. List of Martin Gardner Mathematical Games columns - Wikipedia

    en.wikipedia.org/wiki/List_of_Martin_Gardner...

    A breakthrough in magic squares, and the first perfect magic cube: 1976 Feb: Some elegant brick-packing problems, and a new order-7 perfect magic cube 1976 Mar: On the fabric of inductive logic, and some probability paradoxes 1976 Apr: Snarks, Boojums and other conjectures related to the four-color-map theorem 1976 May

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  4. Play Just Words Online for Free - AOL.com

    www.aol.com/games/play/masque-publishing/just-words

    If you love Scrabble, you'll love the wonderful word game fun of Just Words. Play Just Words free online!

  5. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    For single digit numbers simply duplicate the number into the tens digit, for example: 1 × 11 = 11, 2 × 11 = 22, up to 9 × 11 = 99. The product for any larger non-zero integer can be found by a series of additions to each of its digits from right to left, two at a time. First take the ones digit and copy that to the temporary result.

  6. Perfect magic cube - Wikipedia

    en.wikipedia.org/wiki/Perfect_magic_cube

    In mathematics, a perfect magic cube is a magic cube in which not only the columns, rows, pillars, and main space diagonals, but also the cross section diagonals sum up to the cube's magic constant. [ 1 ] [ 2 ] [ 3 ]

  7. Proof by exhaustion - Wikipedia

    en.wikipedia.org/wiki/Proof_by_exhaustion

    Proof by exhaustion can be used to prove that if an integer is a perfect cube, then it must be either a multiple of 9, 1 more than a multiple of 9, or 1 less than a multiple of 9. [3] Proof: Each perfect cube is the cube of some integer n, where n is either a multiple of 3, 1 more than a multiple of 3, or 1 less than a multiple of 3. So these ...

  8. Magic cube - Wikipedia

    en.wikipedia.org/wiki/Magic_cube

    An example of a 3 × 3 × 3 magic cube. In this example, no slice is a magic square. In this case, the cube is classed as a simple magic cube.. In mathematics, a magic cube is the 3-dimensional equivalent of a magic square, that is, a collection of integers arranged in an n × n × n pattern such that the sums of the numbers on each row, on each column, on each pillar and on each of the four ...

  9. God's algorithm - Wikipedia

    en.wikipedia.org/wiki/God's_algorithm

    God's algorithm is a notion originating in discussions of ways to solve the Rubik's Cube puzzle, [1] but which can also be applied to other combinatorial puzzles and mathematical games. [2] It refers to any algorithm which produces a solution having the fewest possible moves (i.e., the solver should not require any more than this number).