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