Sunday Afternoon Maths LXI

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