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