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