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