Advent calendar 2016

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