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.
Introduction of multiplication and division tables, larger numbers, and measurement of length, weight, and time. If you are looking for these materials, they
Focusing on counting, basic addition and subtraction within 20 and then 100, and recognizing simple geometric shapes. and measurement of length