: Rules for dividing by 2, 3, 5, 9, and 10, as well as prime and composite numbers.

: Digital versions of the test booklets for offline study can sometimes be found in educational communities like VK .

: Platforms like GDZ.ru offer free access to solutions for the 2024 editions and older versions.

: Most tests in Rudnitskaya's book come in two variants. If you struggle with Variant 1, study the solution and then try solving Variant 2 entirely on your own. Where to Find the Materials

: Solve the test questions first without looking at the solutions.

: If your answer differs, use the reshebnik to find exactly where your calculation or logic went wrong.