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