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