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