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

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