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