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