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