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