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