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