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