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