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