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