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