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