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