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