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