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