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