A new and distinct cultivar of Dahlia plant named `DASYTTEN` characterized by ray floret color (fully opened): upper side: near base, green-yellow, RHS 1B transitioning to yellow-orange, RHS 17C; capitulum (composite flower head): 8 cm in diameter, with a large number of ray florets (about 110 to 140); foliage: mature leaves are up to 7 cm in length, mostly compound, with 3 to 5 elliptic leaflets; and plant vigor and growth habit: vigorous, grows upright and is cylindrical in shape.