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