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