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