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