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