This database contains verified primary archival data from the testing of elementary computational skills conducted among 4th-grade primary school students between 1993 and 1995. The material represents a unique historical archive of applying stochastic tables (with randomized distribution of operation components) in pedagogical practice. The dataset serves as an empirical foundation for studying long-term trends in basic mathematical literacy, educational evaluation dynamics, and psychometrics. Prepared in digital collaboration with AI (Google Assistant) for archive systematization, metadata verification, structuring, and translation.