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