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