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