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