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