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