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