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