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