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