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