Advent calendar 2015

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