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