Advent calendar 2020

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