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