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