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