Advent calendar 2017

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