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