M. Averin (part of the "Horizons" series): You can find comprehensive answers for both the textbook and workbook on platforms like GDZ.ru and Reshak.ru. These sites provide step-by-step solutions for tasks, translations of texts, and completed grammar exercises.
For more detailed explanations, especially for the workbook, there are dedicated playlists on YouTube that walk through pages with expert commentary. reshebnik po nemeckomu jazyku 6 klass averin olajn
Most of these platforms are mobile-friendly, allowing you to check answers directly from a smartphone during homework sessions. translations of texts