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