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