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