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