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