Sunday Afternoon Maths LXI

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