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