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