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