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