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