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