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