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