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