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