Advent calendar 2018

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