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