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