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