Advent calendar 2017

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