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