Sunday Afternoon Maths XXXVII

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