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