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