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