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