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Introduction of multiplication and division tables, larger numbers, and measurement of length, weight, and time.

If you are looking for these materials, they are often hosted on Bulgarian educational portals such as Ucha.se or official resource sites like the Ministry of Education and Science. For specialized versions adapted for international use, sources like Archi-Math offer English-translated Bulgarian math textbooks. Step-by-step guides for teaching core topics such as

Step-by-step guides for teaching core topics such as natural numbers, arithmetic operations (addition, subtraction, multiplication, division), and basic geometry. This archive is usually a collection for teachers

Consolidation of arithmetic, more complex geometry (areas and perimeters), and reading data from tables or graphs. Where to Find Similar Resources featuring: Focusing on counting

Practice materials for vertical calculations, measurement units (meters, grams, hours), and simple word problems.

This archive is usually a collection for teachers or parents, featuring:

Focusing on counting, basic addition and subtraction within 20 and then 100, and recognizing simple geometric shapes.