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