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Advent calendar 2017

14 December

There are 204 squares (of any size) in an 8×8 grid of squares. Today's number is the number of squares in a 13×13 grid of squares

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

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