(Мерзляк): Widely used for its "didactic materials" which contain multiple versions of each test.

: Solving the problems first and then checking the answer against the GDZ.

The most popular "GDZ" for algebra control works cover books by these authors:

: Questions ranging from Part 1 (basic skills like simplifying expressions) to Part 2/3 (complex equations or word problems). Time limit : Usually one academic hour (45 minutes).

These are online or printed collections of solutions for standard algebra assessment books used in grades 7 through 11. Teachers use these books to give "control works"—formal tests that typically happen at the end of a chapter or semester to grade a student's progress. Common Sources