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