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