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