GDZ.ru and Resheba.me provide step-by-step solutions for most major workbooks.
The Digital Library of Samara School #27 occasionally hosts PDF versions of these workbooks for distance learning. Рабочая тетрадь otvety dlja tetradi po istorii rossii 8 klass
Most Russian schools use workbooks (rabochaya tetrad) from the following major publishers and authors: otvety dlja tetradi po istorii rossii 8 klass