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