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