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