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