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