Sunday Afternoon Maths LXI

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