Our Abacus Level 4 Book is thoughtfully designed to enhance young learners' arithmetic skills by introducing advanced abacus techniques, fostering efficient mental calculation abilities, and deepening their understanding of mathematical concepts. The book begins by reinforcing addition and subtraction using the Multiple Formula. Building upon this foundation, the curriculum introduces the Inner Big Friends Formula and the Inner Small Friends Formula. By systematically progressing through these structured techniques, the Abacus Level 2 Book equips students with the skills necessary for swift, accurate, and flexible mental calculations, laying a solid foundation for more advanced mathematical concepts in subsequent levels.
