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