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