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