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