is a specialized teaching aid authored by N. B. Istomina and G. G. Shmyreva , designed to accompany the primary Grade 3 mathematics curriculum published by Association XXI Century . Core Content and Structure
Introduction to fractions and basic geometric concepts (shapes, area, and perimeter). Measurement units for length, mass, capacity, and time. is a specialized teaching aid authored by N
Operations including addition, subtraction, multiplication, and division within 100 and up to 1,000. and perimeter). Measurement units for length