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