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