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