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