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