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