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