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