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