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