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