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