Advent calendar 2019

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