Description Key Features of This Textbook 1. A Textbook Faithful to the Curriculum This textbook actively embodies the goals of the 2015 revised curriculum, which aims to nurture creative and convergent thinkers, while also reducing students' learning burden. 2. A Textbook Packed with Learning Materials It includes a variety of hands-on learning materials such as number cards, stickers, shape pieces, nets (unfolded diagrams), transparent film, and mirrors, sparking students' interest and curiosity in learning.