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