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