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