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