Advent calendar 2015

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