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