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