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