A solution guide (often called GDZ in Russian) isn't just for copying answers. When used correctly, it acts as a personal tutor:
Sites like GDZ.ru provide comprehensive coverage for the entire textbook series, including special appendices. A solution guide (often called GDZ in Russian)
How to Effectively Use the 6th Grade Math Solution Guide (Merzlyak, Polonsky, Yakir) A solution guide (often called GDZ in Russian)
Digital versions allow you to find solutions on any device—phone, tablet, or laptop—making it easier to study anywhere. Where to Find Quality Solutions A solution guide (often called GDZ in Russian)
Skysmart offers error-free solutions designed to help you "crack math problems like nuts".