Working systematically

  • All-Variables Sudoku
    problem

    All-Variables Sudoku

    Age
    11 to 18
    Challenge level
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    The challenge is to find the values of the variables if you are to solve this Sudoku.

  • LCM Sudoku II
    problem

    LCM Sudoku II

    Age
    11 to 18
    Challenge level
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    You are given the Lowest Common Multiples of sets of digits. Find the digits and then solve the Sudoku.

  • Colour Islands Sudoku 2
    problem

    Colour Islands Sudoku 2

    Age
    11 to 18
    Challenge level
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    In this Sudoku, there are three coloured "islands" in the 9×9 grid. Within each "island" EVERY group of nine cells that form a 3×3 square must contain the numbers 1 through 9.

  • River Crossing
    problem

    River Crossing

    Age
    11 to 18
    Challenge level
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    There is nothing half so much worth doing as simply messing about in boats...
  • Four coloured wooden cubes balanced precariously to make a tower.
    problem

    Instant Insanity

    Age
    11 to 18
    Challenge level
    filled star filled star filled star

    Given the nets of 4 cubes with the faces coloured in 4 colours, build a tower so that on each vertical wall no colour is repeated.

  • LOGO Challenge - Pentagram Pylons
    problem

    Logo Challenge - Pentagram Pylons

    Age
    11 to 18
    Challenge level
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    Pentagram Pylons - can you elegantly recreate them? Or, the European flag in LOGO - what poses the greater problem?

  • LOGO Challenge - Sequences and Pentagrams
    problem

    Logo Challenge - Sequences and Pentagrams

    Age
    11 to 18
    Challenge level
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    Explore this how this program produces the sequences it does. What are you controlling when you change the values of the variables?

  • LOGO Challenge - Following on
    problem

    Logo Challenge - Following On

    Age
    11 to 18
    Challenge level
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    Remember that you want someone following behind you to see where you went. Can yo work out how these patterns were created and recreate them?

  • Smith and Jones
    problem

    Smith and Jones

    Age
    14 to 16
    Challenge level
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    Mr Smith and Mr Jones are two maths teachers. By asking questions, the answers to which may be right or wrong, Mr Jones is able to find the number of the house Mr Smith lives in... Or not!

  • Rainstorm sudoku
    problem

    Rainstorm Sudoku

    Age
    14 to 16
    Challenge level
    filled star empty star empty star

    Use the clues about the shaded areas to help solve this sudoku