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Advent calendar 2016

2 December

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

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Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

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

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