Sunday Afternoon Maths LXI

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