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