Sunday Afternoon Maths LXI

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