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