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