Advent calendar 2016

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