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