Advent calendar 2019

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