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