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