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