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