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