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