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