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