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