: Next to the answer, include a tiny "reminder" box of the grammar rule being tested (e.g., "Suffix -ek/-ik rule: if the vowel drops, write -ek").

Instead of just a list of answers, this feature would include:

You can find complete answer keys for this specific workbook on popular homework help sites like GDZ.ru or through curriculum resources on YaKlass . from Golub's workbook

gdz po russkomu za 3 klass segodnia stranitsa golub.v.t
gdz po russkomu za 3 klass segodnia stranitsa golub.v.t
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