Advent calendar 2021

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