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