Click here to win prizes by solving the puzzle Advent calendar.
Click here to win prizes by solving the puzzle Advent calendar.



2 December

What is the maximum number of lines that can be formed by the intersection of 30 planes?


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Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

Sunday Afternoon Maths LXV

Cryptic crossnumber #1
Breaking Chocolate
Square and cube endings

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proportion calculus doubling graphs partitions multiplication sequences shape prime numbers balancing floors algebra scales remainders money arrows 3d shapes star numbers percentages dodecagons mean spheres shapes geometry books squares differentiation advent symmetry rectangles parabolas chalkdust crossnumber palindromes people maths ellipses christmas chocolate probabilty rugby sport perfect numbers multiples speed perimeter sum to infinity area crossnumbers volume taxicab geometry cube numbers square roots means sums grids circles menace colouring hexagons cryptic crossnumbers folding tube maps indices ave numbers addition logic regular shapes fractions games factorials wordplay trigonometry square numbers functions odd numbers time lines bases angles quadratics 2d shapes probability averages integers crosswords routes coins number digits surds dates triangle numbers clocks coordinates triangles pascal's triangle planes complex numbers cryptic clues integration irreducible numbers unit fractions polygons factors cards division dice chess


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