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