Sunday Afternoon Maths XIII

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