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