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