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