Sunday Afternoon Maths XIII

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