Sunday Afternoon Maths LXI

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