Sunday Afternoon Maths XIII

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