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The interactive comprehensive reference book for junior schoolchildren is compiled in accordance with the current curriculum of the Ministry of Education and Science of Ukraine. Materials on Ukrainian and Russian languages, literary reading, mathematics, computer science, natural science, and the integrated course "I in the World" are presented in a convenient form.

The publication contains definitions of terms, spelling rules, the procedure for performing mathematical operations, a description of the structure of a computer, and an algorithm for working with some programs. Tables and diagrams will organise the knowledge of the theory and contribute to the formation of competences.

QR-codes located on the pages of the manual contain additional information, video, audio recordings, presentations and test tasks to test students' knowledge.

For students of secondary schools, primary school teachers, after-school care providers, subject club leaders, parents and anyone interested in the integrated learning method.