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