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