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