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