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