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