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