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