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