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