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