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